Implement Bazel build

To run the tests:

  bazel test //...

To build the Gerrit plugin API, run:

  bazel build gerrit-plugin-api:plugin-api_deploy.jar

To build the Gerrit extension API, run:

  bazel build gerrit-extension-api:extension-api_deploy.jar

TODOs:

Licenses
Reduce visibility (all public for now)
Generate HTML Documentation
Core plugins
gerrit_plugin() rule to build plugins in tree and standalone modes
GWT UI (only gwt_module() skylark rule is provided, no gwt_binary())
PolyGerrit UI
WAR
Publish artifacts to Maven Central
Ask Bazel team to add Gerrit to their CI on ci.bazel.io

Contributed-By: Han-Wen Nienhuys <hanwen@google.com>
Change-Id: I9a86e670882a44a5c966579cdeb8ed79b1590de3

gerrit-patch-jgit/BUCK

@@ -39,10 +39,12 @@ genrule(
 java_library(
   name = 'server',
   srcs = [
-    SRC + 'diff/EditDeserializer.java',
-    SRC + 'diff/ReplaceEdit.java',
-    SRC + 'internal/storage/file/WindowCacheStatAccessor.java',
-    SRC + 'lib/ObjectIdSerialization.java',
+    SRC + x for x in [
+      'diff/EditDeserializer.java',
+      'diff/ReplaceEdit.java',
+      'internal/storage/file/WindowCacheStatAccessor.java',
+      'lib/ObjectIdSerialization.java',
+    ]
   ],
   deps = [
     '//lib:gson',