Disable automatic cache invalidation of opcache

This is not needed because files can not change without a deploy, and on deploy the server
gets restarted anyway which clears the cache.
Disable opcache.fast_shutdown. Fixes #84
Added quick docs about ext- requirements
Add default log paths for CakePHP applications
Merge pull request #102 from josegonzalez/cakephp-logs

Add default log paths for CakePHP applications
Merge branch 'development'
Use official repo of pecl/memcache
Update the Readme

* Updating the default versions for NGinx and PHP
* Removed an outdated note about the user-env-compile lab feature
* Added a note about ext requirements needing to be in the root package. Ref #97
Merge pull request #108 from stof/patch-1

Update the Readme
Fix the memcache revision
memcache: fix build script
Merge branch 'master' into development