Merge pull request #72 from ChrisBoesch/master

Updates
Merge pull request #73 from ChrisBoesch/master

Updates
Merge pull request #74 from ChrisBoesch/master

Updates
Merge pull request #75 from ChrisBoesch/master

Updates
Update: Challenge message submission API

- Changed API to suit the current method
Merge pull request #211 from ShaikDawood/master

Update: Challenge message submission API