Merge pull request #26 from alphagov/encapsulation_for_vm

fixing encapsulation for vm model
Fix command line usage. Broken by vapp refactor.
Merge pull request #27 from alphagov/fix_cmdline

Fix command line usage. Broken by vapp refactor.
Remove minifier code. Not needed, flakey.

* minifier.py is of unknown provenance, so not good to keep it.
* does not handle case where preamble is non-bash
* generally not going to be very stable
* push minimiser responsibility to the end user.
Merge pull request #28 from alphagov/remove_minification

Remove minifier code. Not needed, flakey.
improve documentation
Merge pull request #29 from alphagov/remove_minification

improve documentation
merging my commits with removal of minify script commit