Updated the gitignore to ignore NuGet packages, and the NuGet package restore files
Updated solutions to add support for Visual Studio 2013 (Keeping support for 2010 and 2012)
Cleaned up code;

- Converted to tabs instead of 4 spaces.
- Changed some private variable names to be C#4 standards compliant.
- Renamed the WEBAPI class to be WebApi (see above).
- Slightly tweaked the tests to load credential data from a private constant string at the top of the file, so you don't have to set Email/Password info for every instance it's used.
- Cleaned up some foreach's to be LINQ statements
- Decreased nesting where possible.