Check box fixes
Closes #210 (closed)
Problem
some app-checkbox components couldn't be tabbed to properly
Solution
There is a tabNumber input in the app-checkbox component that gets imported into tabIndex in that component. I added the tabNumber to the app-checkbox options.
Additional issue
tabNumber is not in NativeScript. Should we add this as an issue in 1.11? The exact tns files are listed in the issue (210)