Merge pull request #248 from Snorvisable/master

Charting Android fix
updated autocomplete to reflect the code first pattern rather than xaml
cleaned up autocomplete files
Added PopupLayout view

PopupLayout added.
Android chart component fixed.
Merge branch 'master' of github.com:XForms/Xamarin-Forms-Labs

Conflicts:

src/Xamarin.Forms.Labs/Plugins/Charting/Xamarin.Forms.Labs.Charting.Droi
d/Controls/ChartSurface.cs
workaround selected item by @badstorm  close #236
Merge pull request #250 from dirric/master

autocomplete code cleanup
close ##249
update nuget spec beta4
Update Helper.
Merge pull request #253 from saramgsilva/master

Update Helper.