add meta tags to improve twitter share card
add explicit twitter:description
UI Input Improvements

* Allow disabling select input views
* Improve data binding of check box input view
* Improve data binding of select input view
Let itemViewOptions of CollectionView be a function
Merge pull request #218 from schoetty/twitter_card

Add meta tags to improve twitter share card
Merge pull request #221 from tf/improve-inputs

UI Input Improvements
Merge pull request #222 from tf/collection-item-view-options

Let itemViewOptions of CollectionView be a function