Controls work

Added several controls:
* Dial UserControl based off this .NET article:
http://blog.jerrynixon.com/2012/12/walkthrough-building-sweet-dial-in-xaml.html
** Ported from C# XAML Store App Windows 8 to C# XAML Store App Windows
Phone 8.1 framework
** Will serve as the basis for how I manage the two touch points on the
final RadialRange control
* Gauge TemplateControl based off this CodePlex article:
http://www.codeproject.com/Articles/165826/Custom-Gauge-Controls-for-Windows-Phone-Part-I#indicator
** Porting the control from C# XAML Silverlight Windows Phone 7 to C#
XAML Store App Windows Phone 8.1 framework
** Just added the basics - will continue to incrementally add code until
I reach parity with the article
** It currently draws the MarkerIndicator and the RadialBarIndicator as
a child of a RadialScale (statically set the size; need to update to
DependencyProperties)