Restored the "required_times" functionality

Bringing the rest of spencers changes in

Zerofill tweaks

Restored the "fill all the holes" strategy to the ZeroFill class, and introduced the fill_style option ("minimal" and
"all" are possible values). Also allowed a set of required times to be specified when asking the times series for it's
data. This way, we can ensure in the stacked bar chart that each data point in use has a value preventing the bars
from stacking incorrectly.

updated the getFlotPairs() function to only check before and after a value, adding only enough zeros to maintain line graphs.

Adding grunt step to CONTRIBUTING.md

Fixing grunt build and 0 height bars

Creates zero-filled data for the histogram.

Conflicts:
	js/services.js

Added a time series service, which provides a ZeroFilled class, setup the histogram to use it so that zero measurements will be displayed

Improved error handling via alertSrv service

Add panel options, clean up fields list

Fix for count positioning in firefox

added charts to micropanel in table

More paging improvements, moved spy settings to general

New panel tabs, upgraded momentjs, added _mapping to proxy samples