add version number to app builder


![app builder version](https://f.cloud.github.com/assets/249606/2269734/b624e18a-9edf-11e3-84e8-b2670bd3d828.png)


http://dimagi.uservoice.com/forums/194738-app-builder/suggestions/3869990-bring-back-version-s-so-we-can-see-what-version-