Added tf as test suite for bash sripts
Added a Rakefile for tests automation
Added function do determine where phpbrew should be installed
Added a Guardfile for continuous testing
Better test for setting $HOME as prefix for standard user
Installer can detect operating system
Used better test methods
OSX dependencies are installed
Ubuntu deps are installed
Removed Debian from supported os list

Waiting to be sure of lsb_release value and to have the deps install
procedure
phpbrew bin is downloaded and installed