Tidepredict

Added
* csv graph data now outputs time as unix GMT timestamp

Added
* graph data in csv to .tidepredict directory

Added
* CSV mode
* Graph output
Fixes
* Corrected problem with missing directory throwing errors
* Corrected issues with locations including spaces e.g "La Jolla"

Added
* README with some background info and usage information.
* Added the `-b l` option to generate a list of available stations.
* Added automatic finding of the station's timezone so that predictions are output in local time. This broke Python 2 support and I've decided not to support it anymore.
Changed
* Overhauled and changed the way the module stores the constituents so that it now stores additional information about the station such as latitude and longitude. This is saved as a JSON file for human and machine compatibility.