Make README more catchy and full of information (master branch)

Looking at [Top ten reasons why I won’t use your open source project](http://thechangelog.com/post/3032074343/top-ten-reasons-why-i-wont-use-your-open-source-project), it looks like our README is just peace of ... well, you know :). So README should include:

* Description
* Installation instructions
* Where to get help
* Contribution guidelines
* Contributor list
* Credits, Inspiration, Alternatives