Fix gitective-core dependency

Change from Maven local to Maven Central and also fix the
gitective-core version to 0.9.18 as 0.9.18-1 does not exist
on Maven Central.

Change-Id: Id68a61e201ace8e59dc09a25391fea0669cee80f

BUCK

diff --git a/BUCK b/BUCK
index 7887a62..528afcc 100644
--- a/BUCK
+++ b/BUCK
@@ -28,7 +28,6 @@
 
 maven_jar(
   name = 'gitective-core',
-  id = 'io.fabric8:gitective-core:0.9.18-1',
-  repository = MAVEN_LOCAL,
+  id = 'io.fabric8:gitective-core:0.9.18',
   license = 'Apache2.0',
 )