Added a time series service, which provides a ZeroFilled class, setup the histogram to use it so that zero measurements will be displayed
created timeSeries service with a ZeroFilled class to manage the rows for the histogram
moved the timeSeries service into the histogram module.
Merge branch 'zero-filled-ts'

Conflicts:
	js/services.js
Merge pull request #400 from spenceralger/master

Creates zero-filled data for the histogram.
More error handling, changed es loading to use get instead of search
Merge remote-tracking branch 'upstream/master'
spacing
Brought code back into line with existing jshint
fixed 0 height bars
Merge pull request #404 from rashidkpc/master

Fixing grunt build and 0 height bars
Adding grunt step to CONTRIBUTING.md
Merge pull request #405 from rashidkpc/master

Adding grunt step to CONTRIBUTING.md
Merge remote-tracking branch 'upstream/master'

Conflicts:
	panels/histogram/module.js