Open solution in Visual Studio 2013 by default
Create Build, Docs, and Tests solution folders
Visual Studio 2013 reordered items in the solution file
Use explicit build dependencies instead of project references to work around SHFB bugs
Use unique signing keys for each target framework, validate keys during build
Merge pull request #45 from sharwell/build-config

Build configuration
Add Windows Phone 8.1 to the list of supported targets (Profile328 instead of Profile136)
Update documentation projects for the latest release of SHFB
Updated breaking changes policy
Merge pull request #46 from sharwell/windows-phone

Add Windows Phone 8.1 to the list of supported targets
Merge pull request #47 from sharwell/docs-update

Docs update