Merge pull request #8 from XForms/dev

Fixed Windows Phone sample
Adding DS_Store to ignore files
Merge remote-tracking branch 'upstream/master'
Added ViewModel base

Easy to use ViewModel abstract class prevents writing boiler plate code.
update gitignore
Merge branch 'pr/10'
Merge with pr/12
Moved wp sample project, added relay command
Updated sample to show mvvm and ExtendedTabbedBar
Update App
Changed TextToSpeechService dependency registration to include fullname
Merge pull request #13 from brunoshine/master

Changed TextToSpeechService dependency registration to include fullname
Made the Image source Property bindable  fix #11
Adding ExtendedLabel with Android and IOS renders

Allow rendering custom fonts and sizes and specify them in xaml or code.
There should be more properties to be added that make sense. A
Update ExtendedLabel sample with ListView example