Create SegmentControl.cs

Sample Usage:

var s = new SegmentControl();
s.TintColor = Color.Green;
s.AddSegment("Green");
s.AddSegment("Yellow");
s.AddSegment("Red");
s.SelectedSegmentChanged += (object sender, int segmentIndex)=>{
    if (segmentIndex == 0)
        s.TintColor = Color.Green;
    else if (segmentIndex == 1)
        s.TintColor = Color.Yellow;
    else if (segmentIndex == 2)
        s.TintColor = Color.Red;
};
s.SelectedSegment = 1;
d
Revert "d"

This reverts commit 7e8ef3117f11f0a0d4bf5aa82b30af7b8c893f10.
Merge branch 'master' of https://github.com/XForms/Xamarin-Forms-Labs
update from master
Draft for GridView Android #149 it0s more or less working except for the DataTemplate..
Merge pull request #180 from getklickle/patch-1

Create SegmentControl.cs
Update from master. 8/7
Move files and and minor cleanup
Fix nuget reference
fix servicestack nuspec
Removing dependency from ServiceStack.Text nuget
packages fixes
Missing file, my fault!
update from master 8/8
Added preliminary CheckBox control

Works but probably needs more properties added. iOS is using a simple
images on UIButton and changing color would require some extra work.
Might be better to replace with bezier drawings eventually.
Saturday update
iOS bug fix, WP text color change for CheckBox
Navigation aware viewmodel support added.
master downloads from Saturday night