remove CodePrinter.less file
renamed css classes of syntax elements to prevent collisions
added "let" to the keywords in the JavaScript parser
added plaintext mode
some fixes and improvements
reduced the size of the css file
removed calls to unnecessary events
fixed requireStyle function
changed width of screen.fixer
increased version to 0.5.7
Merge pull request #38 from tsapeta/0.5.x

release v0.5.7