Fixes to NuGet packages + extensions

Fixed TinyIOC & ServiceStack package configs.

https://github.com/XForms/Xamarin-Forms-Labs/issues/283#issuecomment-549
89569

Added some extensions to convert native views to images etc.
Fix to ServiceStack serializer

https://github.com/XForms/Xamarin-Forms-Labs/issues/294

Updated unit test projects. Cleanup on HybridWebView.
Tuple support for ServiceStack Droid & WP8
Added ReleaseBuild to ignore

https://github.com/XForms/Xamarin-Forms-Labs/issues/299
Update to Xamarin Forms 1.2.3 pre2
Removed BT from iOS build and device

https://github.com/XForms/Xamarin-Forms-Labs/issues/296
Revert  to Xamarin Forms pre1 #298
Merge branch 'master' of https://github.com/XForms/Xamarin-Forms-Labs
Added ExtendedEntryCell - Enables IsPassword to be set on a EntryCell on IOS and Android based on feedback in code from LeeMallon and Anton from xamarin forums http://forums.xamarin.com/discussion/17530/ispassword-is-there-for-entry-but-not-for-entrycell
testing after reversion back to 1.2.3.pre1
post revert 1.2.3.pre1 merge
CheckBox.Checked BindingMode is TwoWay by default now.
Merge pull request #303 from MihaMarkic/twowaychecked

CheckBox.Checked BindingMode is TwoWay by default now.
Added Extended Switch control with TintColor
Added back press delegate to IXFormsApp

This will be useful for WP8 and Android to prevent back press.
Removing Microsoft.Bcl dependencies

Removed some of the dependencies that are not necessary.
Added Microsoft.BCL v.21 to Xamarin.Forms.Labs.Services.Web.RestClient.WP8 project
Add font scaling to Android ExtendedEntryRenderer
Added font sizing to Windows Phone
Code cleanup

Removed the rest of Microsoft.Bcl references where not needed.
Removed the ServiceStackV3 folder with binaries.