v0.2.3

Summary: This is a general cleanup release

Details:

• The cache will now write its contents to disc periodically, as defined by the tasks.saveCacheToDisk task. The api will also attempt to load in a cache file on boot.
• If you application needs to manage more than one instance of an actionHero test, you can call require('actionHero').createActionHero() rather than require('actionHero').actionHero. createActionHero() will return a new instance of a server each time rather than a shared object.