Changed how XAML Parsing is handled internally

Addresses Issue #4
Updated to latest FsXaml
Merge remote-tracking branch 'upstream/master'
Updated to FsXaml 0.9.2

Corrects final issues with FsXaml usage in VSIX
Removed accidental file addition
Merge pull request #174 from dungpa/master

Update AppVeyor badge
Merge pull request #172 from ReedCopsey/master

Migrate from FSharpX to FsXaml for XAML support