Updated installation docs
Updated installation docs

Lots of changes to the behavior are finally reflected in the docs:

- bootstrapping is now in vagrant/ansible instead of crummy shell scripts
- no dependency on runkit
- no dependency on prepend scripts
- uses spl_autoload registration
- uses composer for 3rd party package dependencies as well as for bootstrapping itself.

Signed-off-by: terry chay <84af3c926ed10f1d6cd2edbb2f961790f318db78@php.net>

tychay/TGIFramework,tychay/TGIFramework,tychay/TGIFramework