Make sucessCallback optional for .mkdir & .write

Change sucessCallback to opt_sucessCallback on Filer.prototype.mkdir and Filer.prototype.write
Fixing broken image in README
Adding bower component.json
Fixing broken JSON
DOM4 Element.remove() collides with my remove() function
removing unecessary things
Merge pull request #27 from mudcube/patch-1

Make sucessCallback optional for .mkdir & .write
Updating version