update bundler used during mvn build

Author: kares

pom.xml

@@ -21,7 +21,7 @@
   <properties>
     <jruby.version>1.6.8</jruby.version>
     <vendor.gems.path>vendor/gems</vendor.gems.path>
-    <bundler.version>1.6.5</bundler.version>
+    <bundler.version>1.7.15</bundler.version>
     <bundler.local>false</bundler.local> <!-- true by default -->
     <saumya.mojo.version>1.0.10</saumya.mojo.version>
     <gem.home>${project.build.directory}/rubygems</gem.home>