start security context refactoring
Merge branch 'master' of github.com:picketlink/picketlink

Conflicts:
	idm/api/src/main/java/org/picketlink/idm/spi/SecurityContext.java
first refactor of security contexts
Merge branch 'master' of github.com:picketlink/picketlink

Conflicts:
	idm/impl/src/main/java/org/picketlink/idm/file/internal/FilePartitionStore.java
	idm/impl/src/main/java/org/picketlink/idm/internal/DefaultIdentityManager.java