d
Revert "d"

This reverts commit 7e8ef3117f11f0a0d4bf5aa82b30af7b8c893f10.
Merge branch 'master' of https://github.com/XForms/Xamarin-Forms-Labs
update from master
Update from master. 8/7
update from master 8/8
Added preliminary CheckBox control

Works but probably needs more properties added. iOS is using a simple
images on UIButton and changing color would require some extra work.
Might be better to replace with bezier drawings eventually.
Saturday update
iOS bug fix, WP text color change for CheckBox
Navigation aware viewmodel support added.
master downloads from Saturday night
sunday morning
Add Help - based in website and in chm file
add helper links
fixes issues

Theses urls must be changed after thr pull request
Merge pull request #200 from saramgsilva/master

Add framework helper (Website and chm file)
Merge pull request #199 from WillooWisp/NavigationAware

Navigation aware viewmodel support added.

I think this makes more sense if we can make the existing BaseView support this out of the box.  

We should make the base view find it's parent navigation page it one exists, and using the week event pattern to hook app this events on BaseView
Fix segmented control
Fix missing Checkbox files and build
fix page checkbox