Downgraded Jackson version to 2.6.5 to address compatibility issue with Spring...

Downgraded Jackson version to 2.6.5 to address compatibility issue with Spring 4.2.4.RELEASE (Jackson 2.7 is not supported until Spring 4.3).

build.gradle

@@ -5,7 +5,7 @@ def vSpringSecurity = '4.0.3.RELEASE'
 def vSwagger = '2.3.1'
 def vHibernate = '4.3.11.Final'
 def vEhcache = '2.6.11'
-def vJackson = '2.7.0'
+def vJackson = '2.6.5'
 def vPostgreSQL = '9.4.1207'
 def vServletApi = '3.1.0'
 def vTomcat = '7.0.67'