Updated project to use common RakeFile

Updated .gitignore to match our standard
Added Provenance.txt file
Created a new rakefile that matches our standard
Removed build_support directory
Added settings directory
Upgraded solution and projects to VS2012
Moved Tests project to DocxToText.Tests
Added tools/NUnit folder
Updated dependencies and moved to .NET 4.5

Updated FluentAssert to version 1.0.0.11
Updated LinqToHtml to version 1.0.0.9
Updated NUnit to version 2.5.10.11092

Had to update project to target .NET 4.5 because dependencies target 4.5
Also, removed CommonAssemblyInfo.cs from source control.
Updated README to match Mvba Open Source Standard