Bug 952041 - Add support for tidy to DIY and PHP cartridges

* Add env variables and code to clean log directories
* Restore start/stop hooks to DIY cartridge
Merge pull request #2073 from jwhonce/bug/952041

Bug 952041 and Bug 952042 - Add support for tidy to DIY and PHP cartridges
doc updates
Automatic commit of package [openshift-origin-cartridge-diy] release [0.2.6-1].
Automatic commit of package [rubygem-openshift-origin-node] release [1.7.27-1].
Automatic commit of package [openshift-origin-cartridge-jbossews] release [0.2.6-1].
Automatic commit of package [openshift-origin-cartridge-python] release [0.2.8-1].
Automatic commit of package [openshift-origin-cartridge-perl] release [0.2.8-1].
Automatic commit of package [openshift-origin-cartridge-jbossas] release [1.0.6-1].
Automatic commit of package [openshift-origin-cartridge-jbosseap] release [2.1.7-1].
Automatic commit of package [openshift-origin-cartridge-php] release [0.2.6-1].
Automatic commit of package [openshift-origin-cartridge-jenkins] release [1.7.7-1].
Automatic commit of package [openshift-origin-cartridge-nodejs] release [1.8.7-1].
Automatic commit of package [openshift-origin-node-util] release [1.7.5-1].
Automatic commit of package [openshift-origin-cartridge-ruby] release [0.2.8-1].