Specify com.google.gitiles group for Maven deployment

Change-Id: Ide346bd32c646f9f52ed3666f330cbab2f2c4582

BUCK

diff --git a/BUCK b/BUCK
index 70d2286..41bc1cc 100644
--- a/BUCK
+++ b/BUCK
@@ -22,6 +22,7 @@
   repository = 'gerrit-maven-repository',
   url = 'gs://gerrit-maven',
   version = GITILES_VERSION,
+  group = 'com.google.gitiles',
   jar = {'gitiles-servlet': '//gitiles-servlet:servlet'},
   src = {'gitiles-servlet': '//gitiles-servlet:src'},
   doc = {'gitiles-servlet': '//gitiles-servlet:javadoc'},