Add new commands for listing, canceling, covering, and adding collateral
by new unique order ID
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Fix build
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop

Conflicts:
	libraries/mail/include/bts/mail/message.hpp