Fix a bug with PythonBinary where I returned the wrong subset of deps.

Test Plan:
Unit tests
diff --git a/plugin/plugin.iml b/plugin/plugin.iml
index b455e26..24e36ea 100644
--- a/plugin/plugin.iml
+++ b/plugin/plugin.iml
@@ -6,7 +6,7 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
-    <orderEntry type="jdk" jdkName="IDEA IC-129.713" jdkType="IDEA JDK" />
+    <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="Java-WebSocket-1.3.0" level="project" />
     <orderEntry type="library" name="buck-lib" level="project" />
diff --git a/src/com/facebook/buck/python/PythonBinaryRule.java b/src/com/facebook/buck/python/PythonBinaryRule.java
index 6a38113..dc617b2 100644
--- a/src/com/facebook/buck/python/PythonBinaryRule.java
+++ b/src/com/facebook/buck/python/PythonBinaryRule.java
@@ -34,6 +34,7 @@
 import com.facebook.buck.rules.RuleKey;
 import com.facebook.buck.step.Step;
 import com.facebook.buck.util.ProjectFilesystem;
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
@@ -81,7 +82,8 @@
         projectFilesystem.getPathRelativizer().apply(main));
   }
 
-  private ImmutableSet<Path> getPythonPathEntries() {
+  @VisibleForTesting
+  ImmutableSet<Path> getPythonPathEntries() {
     final ImmutableSet.Builder<Path> entries = ImmutableSet.builder();
 
     final PythonBinaryRule pythonBinaryRule = this;
@@ -95,7 +97,7 @@
 
           Path pythonPathEntry = pythonLibrary.getPythonPathDirectory();
           entries.add(pythonPathEntry);
-          return getDeps();
+          return rule.getDeps();
         }
 
         // AbstractDependencyVisitor will start from this (PythonBinaryRule) so make sure it
diff --git a/test/com/facebook/buck/python/BUCK b/test/com/facebook/buck/python/BUCK
index 45d7bf3..9b22033 100644
--- a/test/com/facebook/buck/python/BUCK
+++ b/test/com/facebook/buck/python/BUCK
@@ -7,6 +7,7 @@
   deps = [
     '//lib:guava',
     '//lib:junit',
+    '//src/com/facebook/buck/java:rules',
     '//src/com/facebook/buck/model:model',
     '//src/com/facebook/buck/python:rules',
     '//src/com/facebook/buck/rules:build_rule',
diff --git a/test/com/facebook/buck/python/PythonBinaryRuleTest.java b/test/com/facebook/buck/python/PythonBinaryRuleTest.java
new file mode 100644
index 0000000..df457f8
--- /dev/null
+++ b/test/com/facebook/buck/python/PythonBinaryRuleTest.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2013-present Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package com.facebook.buck.python;
+
+import static org.junit.Assert.assertEquals;
+
+import com.facebook.buck.java.DefaultJavaLibraryRule;
+import com.facebook.buck.model.BuildTarget;
+import com.facebook.buck.model.BuildTargetFactory;
+import com.facebook.buck.model.BuildTargetPattern;
+import com.facebook.buck.rules.BuildRuleResolver;
+import com.facebook.buck.rules.FakeAbstractBuildRuleBuilderParams;
+import com.google.common.collect.ImmutableSet;
+
+import org.junit.Test;
+
+import java.nio.file.Paths;
+
+public class PythonBinaryRuleTest {
+  @Test
+  public void testGetPythonPathEntries() {
+    BuildRuleResolver ruleResolver = new BuildRuleResolver();
+
+    BuildTarget orphanPyLibraryTarget = BuildTargetFactory.newInstance("//:orphan_python_library");
+    ruleResolver.buildAndAddToIndex(
+        PythonLibrary.newPythonLibraryBuilder(new FakeAbstractBuildRuleBuilderParams())
+            .addSrc("java/src/com/javalib/orphan/sadpanda.py")
+            .setBuildTarget(orphanPyLibraryTarget)
+            .addVisibilityPattern(BuildTargetPattern.MATCH_ALL));
+
+    BuildTarget javaLibraryTarget = BuildTargetFactory.newInstance("//:javalib");
+    ruleResolver.buildAndAddToIndex(
+        DefaultJavaLibraryRule.newJavaLibraryRuleBuilder(new FakeAbstractBuildRuleBuilderParams())
+            .setBuildTarget(javaLibraryTarget)
+            .addSrc("java/src/com/javalib/Bar.java")
+            .addDep(orphanPyLibraryTarget)
+            .addVisibilityPattern(BuildTargetPattern.MATCH_ALL));
+
+    BuildTarget pyLibraryTarget = BuildTargetFactory.newInstance("//:py_library");
+    ruleResolver.buildAndAddToIndex(
+        PythonLibrary.newPythonLibraryBuilder(new FakeAbstractBuildRuleBuilderParams())
+            .addSrc("python/tastypy.py")
+            .setBuildTarget(pyLibraryTarget)
+            .addVisibilityPattern(BuildTargetPattern.MATCH_ALL));
+
+    BuildTarget pyBinaryTarget = BuildTargetFactory.newInstance("//:py_binary");
+    PythonBinaryRule pyBinary = ruleResolver.buildAndAddToIndex(
+        PythonBinaryRule.newPythonBinaryBuilder(new FakeAbstractBuildRuleBuilderParams())
+            .setMain("foo")
+            .addDep(javaLibraryTarget)
+            .addDep(pyLibraryTarget)
+            .setBuildTarget(pyBinaryTarget)
+            .addVisibilityPattern(BuildTargetPattern.MATCH_ALL));
+
+    assertEquals(ImmutableSet.of(Paths.get("buck-out/gen/__pylib_py_library")),
+        pyBinary.getPythonPathEntries());
+  }
+}