Renaming classes (WIP).
Merge remote-tracking branch 'origin/refactor' into rename

Conflicts:
	include/maidsafe/account.h
	include/maidsafe/detail/account_handler.h
	include/maidsafe/private_client.h
	src/maidsafe/account.cc
	src/maidsafe/tests/account_handler_test.cc
	src/maidsafe/tests/private_client_test.cc
Initial API updates complete.