Merge remote-tracking branch 'goorus/master'
Merge remote-tracking branch 'goorus/master'
Merge remote-tracking branch 'gooru/master'
*improvements on Feedback
Merge remote-tracking branch 'gooru/master'
Merge remote-tracking branch 'gooru/master'

Conflicts:
	api/src/main/java/org/ednovo/gooru/domain/service/FeedbackServiceImpl.java
	api/src/main/java/org/ednovo/gooru/infrastructure/persistence/hibernate/FeedbackRepositoryHibernate.java
Merge remote-tracking branch 'goorus/master'
Removed unused variables and code improvements
*Fixed [IClass & Assignment]  show proper error message
*Implemented Error validation CORE-1323 [Rating , Reactions & Tagging] Show proper validation error message
*naming convention on logger
Updated Pom.xml with latest Restlet Version
Code Quality Enhancement(Removed skipPagination and made relevant changes).
fixed NPE issue getCollectionItems API
Code Quality Enhancement(Removed skipPagination and made relevant changes).
added constants for ScollectionServiceImpl
Merge pull request #411 from parthibane/master

Added support to save content statistics data to cassandra - CORE-137
Merge remote-tracking branch 'goorus/master'
Removed unused code and code improvement
Merge remote-tracking branch 'gooru/master'