- Add local wrapper for SocietiesAndroidContext service. 
- Use expiring cache to cache entities, attributes, associations created
and retrieved objects.
- Use string of the identifier as a key in the expiring cache, instead
of the CtxIdentifierBean.
- Modify remove method to remove objects from the cache after
removing them from the cloud.
- Modify update method to update objects from the cache after updating
them in the cloud.
- Use ConcurrentHashMap instead of LinkedHashMap in the ExpiringCache.
Merge branch 'development' into ContextAndroid_Helper
- Add CtxEntityTypes and CtxAssociationTypes in android API.
- Implement lookup method in ContextClientHelper that looks up using the
ctxEntitityIdentifier. 
- Implement retrieveIndividualEntityId method in ContextClientHelper. 
- Implement update method in ContextClientHelper.
- Add RETRIEVE_INDIVIDUAL_ENTITY_ID and UPDATE to the
ContextClientHelper Receiver and the Intent Filter of the
ContextClientHelper. 
- Add test for retrieving location and updating a ctxAttribute.
Merge branch 'development' into ContextAndroid_Helper