[FIX] Updated to conform to the latest gateway services protocol spec
[FEATURE] Get and set last payment hash in database.

[FOLD] Use plain getColdWallet function.

[FOLD] Set current hash not previous hash.

[FOLD] Remove redundant lastHash if check.
[FEATURE] Now using sqlite db for test(in memory) and development (filename) env.

[FEATURE] Grunt migration works with the new environment specific databases

[FIX] Need to keep a postgres db for tests as the running the old tests in a sqlite in memory instance breaks some of the old tests.
Merge branch 'update-testing' of https://github.com/cdmcnamara/gatewayd into update-testing