Upgrade soy to version 2015-04-10

To match the version used in gitiles-servlet since 0.1-7.

Change-Id: I7270d58c995d2da9f20fb2c41e368cb0a2daf684
diff --git a/BUCK b/BUCK
index 7af1744..a26293c 100644
--- a/BUCK
+++ b/BUCK
@@ -79,14 +79,13 @@
   visibility = [],
 )
 
-# soy must match closure-template version used in Gitiles
+# soy version must match version used in Gitiles
 maven_jar(
   name = 'soy',
-  id = 'com.google.template:soy:e74fcfa284a1e31d42ac93e53cb84a71f638c70b',
-  sha1 = '1c75a007218f29d6124c46c8b18f4158cba4839c',
+  id = 'com.google.template:soy:2015-04-10',
+  sha1 = 'f2a260c0eafbc5756ccec546efd2ffd5b0a583cb',
   deps = [':icu4j'],
   license = 'Apache2.0',
-  repository = GERRIT,
   visibility = [],
 )