pamelafox/lscache — pull request #37 by ready4god2513 (2014-11-08 00:24:47+00:00)
Title: Update readme to include fetch

Often times I will want to add something to the cache only if it is not yet set. I can make this two different calls, but doing so gets a bit repetitive and unwieldy. `fetch` wraps the two method calls up in to a single call with a callback to run if they key is not found.