Basic Java Backend

Site stores submitted code in memory. Can't display it yet as I'm not so
good with JavaScript. Current JavaScript and Java is a quick copy (read:
blatant ripoff) from Märt's sample webapp. 

Changed index.html to make my work easier, it has to be changed back.
Merge branch 'master' of https://github.com/TKasekamp/Veebirakendus.git