Insert semicolons

It's recommended to always use semicolons in JavaScript. Have a look at the point #7 of the accepted answer: http://stackoverflow.com/questions/6950636/justifying-crockford-claims
And this one: http://stackoverflow.com/questions/444080/do-you-recommend-using-semicolons-after-every-statement-in-javascript
Change everything to single quotes to be consistent
Change indentation to 2 spaces

Most of the modern JS frameworks use 2 spaces as well as the grunt and its internal tasks.
Merge pull request #2 from NameFILIP/patch-1

Fix some style errors