Fix wallet setting loading (#312)
Ensure proper cleanup on wallet creation, opening and closing (resolves #347)
Merge branch 'master' of github.com:BitShares/bitshares_toolkit

Conflicts:
	libraries/wallet/include/bts/wallet/wallet_db.hpp
	libraries/wallet/wallet.cpp
	libraries/wallet/wallet_db.cpp
Merge pull request #354 from vikramrajkumar/master

Fixes