Generalize identifiers types in GenericRepository.
Add post survey answers endpoint.
Get linkedin data
Merge branch 'master' of https://github.com/estebanroblesluna/ssurvey

Conflicts:
	modules/ssurvey-webapp/src/main/java/com/ssurvey/web/controllers/SurveyController.java
	modules/ssurvey-webapp/src/main/resources/applicationContext.xml
Fix problems when persisting linkedin data.

Remove cascading for eficiency.