Add pry-debugger to deps; point machete to local path for debug
Updates wordpress composer.lock
Modify deploy_spec to use new machete Browser matchers
Test PHP sticky session configuration
Merge remote-tracking branch 'upstream/master'

Conflicts:
	cf.Gemfile
	cf.Gemfile.lock
Merge branch 'master' of https://github.com/Orange-OpenSource/php-buildpack