Closes #11, added Sinatra Reloader, looked simpler than using rerun as described here:

http://stackoverflow.com/questions/1247125/how-to-get-sinatra-to-auto-reload-the-file-after-each-change
Merge pull request #12 from adamtaylo/issue-11

Merging Sinatra reloader into master. Tested on branch and all looks good.