More reliable bower install postinstall.

This makes the bower i work on Mac, Win.
Add mismatchTolerance, update PhantomCSS.
Add copyright notice, update README.
v0.3.0

* Added `mismatchTolerance` tolerance (`mismatchTolerance: 0.0.5` is default) (thx [fidgety](https://github.com/chrisgladd/grunt-phantomcss/pull/17))
* Use PhantomCSS v0.7.1
* Update dependencies
* Remove grunt as peerDependency causing multiple issues with peerPackages
* Fix post-script `bower install`
Small changes to code style

Mostly re-indentation or similar.
Update visual regression test screenshots.
Update dependencies.
Add editorconfig, update Grunt task.
v0.3.1

* Add time-grunt to measure build times
* Add jit-grunt to load tasks only when needed (+ improve performance)
* Change log level to notice in Gruntfile
* Document correct CasperJS log levels and pass them as arguments / option
* Added .editorconfig
Get back to notice log level
Add `waitTimeout` as option
Add mismatchTolerance as an option in documented options
Update dependencies
v0.3.2
Update package.json

Change postinstall script to call local bower
Update bower.json
Update package.json
Update package.json
Update package.json
Update package.json