(#146) Check to see if running on AppVeyor

- Reset AssemblyInfo.cs file back to initial values
- Added check, using APPVEYOR environment variable, to see if running on AppVeyor
  - Used this as basis: https://github.com/Particular/GitVersion/blob/a4b40aaec5a7bc1f9bb668fed5c4879dc36f8099/GitVersionCore/BuildServers/AppVeyor.cs
- General spacing changes around }'s
Merge pull request #147 from gep13/feature/Issue-146

Check to see if running on AppVeyor