Merge pull request #107 from danzel/vnext

Add ExecuteScalar to Sqlite plugin - Thanks - assuming this builds... pulling :)
Allow easier inheritance for custom Android presenters
Merge remote-tracking branch 'mvvmorigin/vnext' into vNextDialog
Find<T> added to SQLite
Add tableview grouped/plain constructor
Add Find<T>
Merge branch 'vnext' of https://github.com/slodge/MvvmCross into vnext

Conflicts:
	Cirrious/Plugins/Sqlite/Cirrious.MvvmCross.Plugins.Sqlite/BaseClasses.cs
Improved Touch collection objects (Cells)
DropTable added to SQLite interface
Merge branch 'vnext' of github.com:slodge/MvvmCross into vNextDialog
Add some extension method to enable Dialog binding from code - http://stackoverflow.com/questions/14384229/mvvmcross-android-dialog-bind-programmatically
Important flexi visibility fix for strings
Fix Sqlite ExecuteScalar regression.