Allow Data or Feed for Rickshaw Graphs

Lets clizia graph static x,y data
Update logic for data_or_feed

A metric object either has an data param or a feed param, feed having precidence.

For updates, the method now accepts the metric object from the original chart creation render
whitespace creep, spelling, indentation

from anchor/machiavelli#69
Merge pull request #5 from anchor/data_or_feed

Allow Data or Feed for Clizia Graphs