Release v0.3

[cameronfletcher]

• Update NuSpec release notes
• Raise pull request from release branch
• Merge pull request into master
• Remove all beta packages from NuGet.org
• Tag release and push tags
• Rebase dev branch to master
• Increment version.txt with new version
• Change NuSpec release notes to TBD
• Create new issue on Github for next release
• Reset build counter on TeamCity
• Delete all development NuGet packages from NuGet server
• Push changes to dev