Merge pull request #52 from NewETown/develop

README tweak
Bump version number to 3.0.
Update Message.cs

I think this will fix the recipients invalid cast exeption bug
Merge pull request #54 from Quacil/patch-1

Update Message.cs
 * Add warnings property to Message model
Merge pull request #53 from bradserbuddy/VersionNumber

Bump version number to 3.0.
Disable Shared Secret for now until Windows Phone issues are resolved
Merge pull request #56 from nickatbuddy/na_disable_ssecret

Disable Shared Secret for now until Windows Phone issues are resolved