Updated to reflect changes in vault.
Cleanup Pmid Health/Registration code.
Merge branch 'account_transfer' into MAID-359_account_transfer

Conflicts:
	include/maidsafe/nfs/types.h
	src/maidsafe/nfs/client/messages.cc
Added missing drive functions.
Merge pull request #23 from BSMaidSafe/MAID-359_account_transfer

Maid 359 account transfer