Build.sh

Added a simple build script to run before submitting pull requests.

Spawns an xterm for each dockerfile in the repo and tests to make sure it builds. Accepts arguments. Highly recommend passing --no-cache when verifying builds actually build.
Most systems have it and I wanted to be able to do this:

![snapshot](https://cloud.githubusercontent.com/assets/1081565/4544476/96a9daaa-4e33-11e4-82dd-23e5414862ba.png)

I could work on making it generic if necessary. Was meant to be an off-the-cuff hack that can be extended as people need to run it on systems without xterm.