Added salesforce_entity module, with overrides to salesforce_mapping to
add overwrite rules to mappings. Entity CRUD still on the way.
Minor code cleanup of salesforce_entity
Misc doc clean up
Merge branch '7.x-3.0-salesforce_entity' into 7.x-3.0-qa

Conflicts:
	salesforce/salesforce_queue/salesforce_queue.module
Merge salesforce_entity into salesforce_sync