Merge pull request #2 from DaAndi82/master

merge new feature: sending formatted source code
cleanup code
replace static classes with simple oo
manually merge and improvement of pull request 3
update README.md
Merge branch 'master' of https://github.com/SSilence/sum

Conflicts:
	app/index.html
	app/main.css
	app/sum-frontend-events.js
	app/sum-frontend-helpers.js
	app/sum-frontend.js
* fix issue #4
* use grunt for building node webkit application and the setup (see README.md)
update README.md
* fix #8: select all after leaving room
* some smaller design improvements
#6 save open rooms on application restart
#5 new Button for clear conversation text
Merge branch 'master' of https://github.com/SSilence/sum

Conflicts:
	app/index.html
	app/main.css
	app/sum-frontend-events.js
	app/sum-frontend.js