update nuspecs
Merge pull request #342 from Applifting/Feature-CalendarImprovement

Calendar control improvement
Fix for #333
Change the read me, better organization.

The Website http://xforms.github.io/Xamarin-Forms-Labs/ uses this version.
Merge branch 'fix-333'
Update Helper
Merge pull request #347 from saramgsilva/master

Update Helper
Fix for the iOS sample project
Update to Xamarin Forms pre-4
Add branch info
New build for 1.2
Merge branch 'master' of https://github.com/XForms/Xamarin-Forms-Labs
Added ButtonGroup control and sample page
Merge from Upstream/Master
Added support for custom TypefaceCaches