Merge pull request #317 from HackFisher/master

Fixed 2 issues
Ticket #315 - fix delegate pay API
#321 inactive -> standby
Merge branch 'master' of https://github.com/BitShares/bitshares_toolkit
Ticket #314 - unit tests for delegate pay
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
Improve response when listing wallets and none exist

Previously, if the wallets directory didn't exist, a big ugly exception
message was printed. Now if the directory doesn't exist, or if it is
empty, a message stating that no wallets were found is printed instead
of an error.
Merge branch 'master' of github.com:BitShares/bitshares_toolkit
Update submodule
Fix blockchain parameter range validation, when start is larger than block head then return empty vector