Fix the way bash is invoked.
Fix the way bash is invoked.

Using /usr/bin/env is more portable to various *nix flavours.
Fixes #2688


	See: cakephp/cakephp@5713cd3269fb4cbc0cd86f21d0b03418a3015916


QoboLtd/project-template-cakephp,ojengwa/cake-appengine,makallio85/fish-diary,makallio85/fish-diary,QoboLtd/project-template-cakephp,QoboLtd/project-template-cakephp,ojengwa/cake-appengine,QoboLtd/project-template-cakephp,makallio85/fish-diary,QoboLtd/project-template-cakephp