Interface definition for sending message to disaster volunteers
Merge pull request #124 from battenworks/master

Interface definition for sending message to disaster volunteers
Merge pull request #125 from slackshot/master

Crisis Checkin Xamarin Projects.
Concrete implementation of IMessageService.
Merge pull request #127 from battenworks/master

Concrete implementation of IMessageService.
Windows phone commit
Merge pull request #128 from JonDouglas/master

Windows phone commit
Login functionality.
Small change missed.