Added long line length example to Checkbox control. Modified iOS checkbox renderer to enable word wrap.
Merge branch 'master' of https://github.com/XForms/Xamarin-Forms-Labs
Added BT test page

BT currently works for WP8, whatever limited functionality there is,
needs troubleshooting on Android. iOS support (if possible) in the
future.
Added Swipe to TabbedPage
Merge pull request #209 from Snorvisable/master

Numerous updates on charts (including the pie chart). See conversation for more details.
Restore Help folder. Related with #213.
Merge pull request #217 from saramgsilva/master

Restore Help folder. Related with #213.