Fixed merge 2.
Nicer test page and arrows can hide.
Some texts.
server.js is redundant.
Playing with Travis CI.
Mongo would be nice.
LESS is now translated during build.
Run some tests.
Merge pull request #62 from progma/jdi-showcase

Jdi showcase
Code served to a user should contain only user's code.
Merge pull request #63 from progma/userCode-serving-bugfix

Code served to a user should contain only user's code.
Added language libraries.
Browserified sweet.js library.
Code evaluation refactorized.
Employ sweet.js as syntax checker.
Small cleanup.
Turning animate off now works.
Initial work on live coding.
Show errors while typing.
Different running time on live coding.