Create release 0.2.0, improve the readme and add a history file

The kind of defacto standard for readme files of grunt plugins phrases this with an implied subject in a blockquote below the title.

See:
* https://github.com/gruntjs/grunt-contrib-concat#readme
* https://github.com/gustavohenke/grunt-jscs-checker#readme

<img src="https://cloud.githubusercontent.com/assets/156867/3415615/f09c0cf6-fe22-11e3-9214-24f5799b99de.png" width=300><img src="https://cloud.githubusercontent.com/assets/156867/3415614/f09b190e-fe22-11e3-90c3-90b30821241b.png" width=300>