Version dialog

This is a subset of the changes from #1316 that updates the version dialog to not show
the old version information. It drops the XKCD dependency since the python components
for that were not working with jenkins. Hopefully at some point that can be fixed and
included.
![screen shot 2014-12-13 at 12 56 05 pm](https://cloud.githubusercontent.com/assets/618346/5424873/960324f8-82c7-11e4-895c-7c51524f65ea.png)

@guilhermito are you ok with this?