Changes to import and metric properties

• Added .name and .abbr properties to each metric to give a little bit more info to the users, and also for ease of use in the Hydrostats package.
• Allowed users to import all metrics by simply using import HydroErr instead of import HydroErr.HydroErr.

Changed Location of Documentation

Documentation has been moved to https://hydroerr.readthedocs.io/en/stable/.

Updates to Coverage and Warnings

Updated the coverage (Now 99%) as well as fixing the ways some warnings are ignored (In the treat_data function).

Updates to required dependencies and some function

• Removed all dependencies except scipy and numpy
• Updated mb_r() metric
• Updated documentation

Updates to documentation

In this release, we updated some of the documentation and had some bug fixes for the python 2.7 build of the package.