0.6.0: Add Caching Adapter for requests (#10)

* add redis deve dependencies

* add base cache files

* spec file update

* add redis to circle

* finish up spec tests for cache layer

* add commented out code for potential improvement some day

* wait for redis

* set redis env

* force a wait

* use env variable; remove sleep

* typo

* it knows how to connect without this

* set it cuz tests need it

* use marshal instead -- much better and skips validations

* add custom key capabilities

* stooopid cloning error; references will be the death of me

* grep like feature for cached items

* readme and bump version gem; changleog

* stochastic_cache_bust cache option