Initialising the Section list for RootElements created for the RadioGroup and Summary constructors.
Merge pull request #103 from jacobtoye/RadioGroupFix

Fix for RootElement Sections list
Add FolderExists and DeleteFolder to IMvxSimpleFileStoreService.

- Not implemented on WinRT
- WinPhone doesn't support recursive delete
Rename DeleteDirectory implementation to DeleteFolder like they should be.
Fix for cached image file issue - needs further dev testing - e.g. can we load resource files
Add Sqlite plugin for Windows Phone - relies on binaries from sqlite
Merge remote-tracking branch 'mvvmorigin/vnext' into vNextDialog
Simple changes
Merge pull request #104 from danzel/vnext

Add FolderExists and DeleteFolder to IMvxSimpleFileStoreService.
Add ExecuteScalar to Sqlite plugin
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