Add script to bump versions

[jdegoes]

To make this usable, we need a script that bumps versions to the most recent set of mutually compatible versions, builds the packages, and runs all their tests.

Seems like something in the bower ecosystem could be leveraged to do this.

[garyb]

I've been working on something like this to help manage core library releases when dependant packages are bumped, we could just add this to the list of repos it considers.