Made beginings of a cache
Added cacheing to the other methods.
Ok, we have the test, now let's build the interface!
First pass of the Redis cache interface.  Needs exception handling.
Added timeouts; tests aren't passing
Fixed the tests.
changed current temp and summary to use new currently in docs
changed hourSummary to minutely.summary in docs
fixed to rest of the readme
Merge branch 'master' into develop

Conflicts:
	README.md
	src/darksky/DarkSky.py
changed cw tp ds_response to make everything match in the README. Also fixed the code block in the README