Adding XAMLSamples sample
[crm] update to latest Xamarin.Forms version
Added metadata file for MobileCRM
[working-with] add all samples from working-with docs
[working-with] add custom renderer doc sample
[working-with] add metadata & readme files
[working-with] fix metadata to remove from gallery
[working-with] add screenshots to READMEs
[working-with] add screenshots to READMEs
[crm] add comments to help new users figure out Android maps
[XamlSamples] Simplified OnPlatform

Changed OnPlatform markup to use property attributes rather than
property elements, and refreshed to Build 6206.
[EmployeeDirectory] Forms version of EmployeeDirectory sample
[todo] added missing images (fixes exception on start)
[EmployeeDirectory] give credit
[FormsGallery] Fixed Issue #21

MasterDetailPage: Added Title property. Also upgraded build to 6206, and
upgraded TapGestureRecognizer.
[working-with] add icons, some comments
[working-with] fix colors screenshot
[working-with] add Gestures sample from Charles
[working-with] add image tap to gestures
[working-with] tidy up gestures