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travis-ci

Histogram (#888)

* Add Histogram as a visualization

The css and js file use the histogram code from https://bl.ocks.org/mbostock/3048450.
THe viz.py extends from BaseViz to create chart data only for one histogram

* using d3.layout.histogram

* CSS updated

The new css has been used from the d3 chart http://bl.ocks.org/mbostock/1933560

* bars are visible

* added semicolons

* histogram from http://bl.ocks.org/mbostock/1933560

It takes as input no of bins. The histogram cycles through
a set of colors for different lengths of the bar. It places a
y axis coordinate on top or on the upper end of the bar
whichever is suitable.

* update style changes

29 of 29 new or added lines in 1 file covered. (100.0%)

2733 of 3374 relevant lines covered (81.0%)

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