Merge pull request #6 from aivot-on/master

Add support for toggling styles
appendChild type changed.

Sometimes head element could be missing. In that case that script could break out. Now it just searches the first element and than appends it-self.

More: http://www.stevesouders.com/blog/2010/05/11/appendchild-vs-insertbefore/
Merge pull request #8 from aivot-on/master

Updated readme
Merge pull request #9 from boralp/master

appendChild type changed.