Remove version requirement from FSharp.Core
Add support for Windows Runtime

This commit does not make any changes to the NuGet package.

The Options.WinRT project file contains only links to the existing
Options code. Support for F# was removed, as it does not exist in
WinRT. Similarly, support for serialization in NoneException was
removed.

This commit also updates the solution file to 2012.
Merge pull request #3 from JustinPierce/options-winrt

Support for WinRT
Bumped version. Added Justin as an author.
Removed packages from repo
Updated NuGet
Build multi-framework package
Support for Windows Phone 8
Remove spurious PlatformTarget in WP8 project
Version bump for WP8 bug fix
Support for asynchronous operations.

PowerShell script to ease the pain of building Windows Phone :shit:.
Version bump
Added implicit conversion operators to Option<TOption>.
Add support for comparing Option<TOption> values to TOption values.
Extension method for IDictionary.
Add implicit conversion operators to Either<TFirst, TSecond>.