Release process: documented.

Transferring the release process to brooklyn.io from an internal Cloudsoft document.
Updated following release 0.6.0-M1.

The latter sections will need validated while releasing 0.6.0 (next full release).

Certain sections and bash variables have been updated, allowing easier customisation for different local source locations. 

NB. Jekyll markdown used, so looks terrible viewed on GitHub.

![release process screenshot](https://f.cloud.github.com/assets/879000/962095/301db296-04e9-11e3-9e3a-0c0c24450196.png)