Fix regression tests
Add mail client

Much work remains to be done.
Improve exception error
adding method to publish multiple price feeds at once
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
pay fee with BitAssets
Enable voting for recommendations of non-delegates
remove assert on keys stored without an account (onetime keys)
Further development on mail client.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Mail client now resumes processing of pending messages on open
Add some calls to get information about mail from client

Also fix some bugs in the proof of work segment of the mail processing
pipeline
Improve wallet_scan_transaction
Bump fc
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Fix build
[GS] Refactoring format_and_print_result()
[GS] Update regression tests
Merge branch 'develop' of https://github.com/bitshares/bitshares_toolkit into develop

Conflicts:
	libraries/cli/cli.cpp
Update submodules