allow config to be loaded from env variables
create data dir recursively
experimental redistogo data adaptor
load config before data adaptor.
use ENV.REDISTOGO_URL to set config.
added heroku setup instructions to readme
Add the plugin
Nope, not in this PR.
tabs not spaces
Merge pull request #5 from tinyspeck/heroku

Heroku/Redis support
Add smarty compile id to prevent problems with using a single cache dir

The plugin instance function is using a single compile directory for
multiple template directories. A compile id will prevent collisions
within this folder.
Merge pull request #6 from there4/smarty-cache-signatures

Add smarty compile id to prevent collisions when using a single cache dir