added constants for ScollectionServiceImpl
Merge remote-tracking branch 'gooru/master'
added constants for ConstantProperties
Merge branch 'master' of https://github.com/cyrilraja/Gooru-Core-API

Conflicts:
	gooru-
core/src/main/java/org/ednovo/gooru/core/constant/ConstantProperties.java
added constants for FeedbackServiceImpl

Conflicts:
	api/src/main/java/org/ednovo/gooru/domain/service/FeedbackServiceImpl.java
added constants for ResourceServiceImpl
added constants for SessionServiceImpl
added constants for TagServiceImpl

Conflicts:
	api/src/main/java/org/ednovo/gooru/domain/service/tag/TagServiceImpl.java
added constants for FeedbackRestV2Controller
added constants for LibraryRestV2Controller
added constants for ResourceRestV2Controller
added constants for SessionRestV2Controller
Merge remote-tracking branch 'gooru/master'

Conflicts:
	api/src/main/java/org/ednovo/gooru/domain/service/ScollectionServiceImpl.java
	rest-
v2-app/src/main/java/org/ednovo/gooru/controllers/v2/api/LibraryRestV2Controller.java
*added missing constants for resource and session
Merge remote-tracking branch 'gooru/master'
*CORE-1400 [user & Profile] Follow user validation
Merge pull request #416 from cyrilraja/master

added constants for ScollectionServiceImpl