Add script to travis build to regenerate website repo

[titaniumbones]

This is a bit of a tricky problem (cf #43). Since we are using github classroom, the best solution for getting student info into the website is to add some kind of a script to travis that rebuilds the website after tests run & pass. here's one option:

• tests run, pass
• travis clones the website repo locally
• travis copies the relevant files (githubid.jpeg, githubid.md) into the website repo
  • issue: travis needs to somehow suss out the ghid of the student. What's the best way to do this?
• travis runs the website creation script (createjson.js)
• travis pushes to the gh-pages branch of the website, ta-da,we're done.

Since I'm just spitballing... what do you think of this @jevi-me?