Add font scaling to Android ExtendedEntryRenderer
Added font sizing to Windows Phone
Added text alignment support to Android
Added comment explaining that HasBorder is not supported on Android
strongly types OnElementPropertyChanged in iOS
Re-ordered controls list alphabetically and standardised names. e.g. Labels to ExtendedLabels etc..
Updated screenshots for ExtendedEntry
Added more xamarin named size examples
Added more test cases to extended entries page
Finished off updates to renderers. Added NotCurrentlySupported comment for items that have not been developed on a particular platform.
Merge branch 'master' of https://github.com/XForms/Xamarin-Forms-Labs

Conflicts:
	src/Xamarin.Forms.Labs/Xamarin.Forms.Labs.sln (took local!)