Set explicit top-level targets for Bazel build

Define at the top-level BUILD the two targets that
the build process should generate and move them
from their inner project top the top-level directory
so that becomes easier to archive them from the CI
with the correct expected names:
- github-oauth.jar
- github-plugin.jar

Change-Id: Ie1fca005e9c13912f42b6a989798f48054a292c6

BUILD

diff --git a/BUILD b/BUILD
index e69de29..501159f 100644
--- a/BUILD
+++ b/BUILD
@@ -0,0 +1,13 @@
+genrule(
+    name = "github-oauth",
+    srcs = ["//plugins/github/github-oauth:github-oauth_deploy.jar"],
+    outs = ["github-oauth.jar"],
+    cmd = "cp $< $@",
+)
+
+genrule(
+    name = "github-plugin",
+    srcs = ["//plugins/github/github-plugin"],
+    outs = ["github-plugin.jar"],
+    cmd = "cp $< $@",
+)

github-oauth/BUILD

diff --git a/github-oauth/BUILD b/github-oauth/BUILD
index 05e694b..4f80450 100644
--- a/github-oauth/BUILD
+++ b/github-oauth/BUILD
@@ -4,6 +4,7 @@
 java_binary(
     name = "github-oauth",
     main_class = "Dummy",
+    visibility = ["//visibility:public"],
     runtime_deps = [":github-oauth-lib"],
 )