Merge pull request #260 from Snorvisable/master

Calculation of number of columns and adjust on orientationchanges.
Added Popup support for top/bottom

Tested on WP8. Will add left/right later.
Changed JSON serializer for Android

https://github.com/XForms/Xamarin-Forms-Labs/issues/255#issuecomment-536
15901
Added Android ImageGallery
Merge pull request #261 from jguertl/master

Android ImageGallery
Fixes to ServiceStack serializer

DLL needs to be compiled as ServiceStack.Text.Droid.dll, renaming it
will not work.
Added CameraView renderer for WP8
Added rotation support for WP8 app

Plus fixed camera orientation.
Added HasBorder to extended entry
Initial draft of IAudioStream

Audio streams for iOS, Android & WP8. WaveRecorder class to store WAVE
audio files.
added IconButton for iOS
Merge remote-tracking branch 'upstream/master'
remove unnecessary title edge insets on IconButton
Merge pull request #265 from ryanwischkaemper/master

added IconButton for iOS
Merge pull request #264 from jimbobbennett/ExtendedEntry

Added HasBorder to extended entry
Android HybridWebView updated
Modified e-mail service to include attachments

Put in draft for attachment for Android
Refactored intent attachment to extension
E-mail services registered with Xamarin.Forms
Added NFC device

Currently able to start Xamarin Labs sample on WP8 by beaming from WP8
or Android device. WP8/Android to Android will open “New tag scanned”
activity on Android, the Labs app has not been yet registered to handle
the Uri.