Include resources for Buck build

The Buck build was missing the documentation files in the jar, hence
we now include the resources, so depending plugins can use its-base
files.

Change-Id: I15cf8ac6362623675fdf0066242a61522e7f52a7

BUCK

diff --git a/BUCK b/BUCK
index 16ec787..c5d6009 100644
--- a/BUCK
+++ b/BUCK
@@ -13,6 +13,7 @@
 gerrit_plugin(
   name = 'its-base',
   srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/resources/**/*']),
   provided_deps = DEPS,
 )