Bump dependencies and update test

The test was updated, since the css-loader had
changed its output format. More information:
https://github.com/webpack/css-loader/issues/17
Fix misspelled option in docs
Resolve issue #1

* Output a warning if unknown options are used
* Added JSON syntax to docs
* Added test for two browsers
Merge pull request #13 from cody/update

Bump dependencies and update test