service class
working exdample fix error with junit import
created getRootFolder() and getChildren() methods
Merge branch 'origin/LABA-49'

Conflicts:
	core/src/test/java/com/engagepoint/labs/core/dao/FSFileDaoImplTest.java
	core/src/test/java/com/engagepoint/labs/core/dao/FSFolderDaoImplTest.java
Added java docs to DAO file and DAO folder
Merge branch 'origin/LABA-47'