removed the Cheffile which was causing Vagrant to load in cookbooks.
integrated Ruth's directions for compiling and enabling php 5.3. these directions for salt exist in their own state file within the php dir. this does extend the build time significantly
removed a comment from the php-53.sls file that was causing parse errors.
Merge branch 'salt-provisioning' of github.com:elifesciences/elife-vagrant into salt-provisioning