Implement RPC call to get a block's signing delegate's name (resolves #319)
Fix all compiler warnings (resolves #320)
Restore wallet import/export to JSON (resolves #66)
Merge branch 'master' of github.com:BitShares/bitshares_toolkit

Conflicts:
	libraries/cli/cli.cpp
Merge pull request #348 from vikramrajkumar/master

Issue fixes