added d3 and rickshaw dependencies. Gruntfile.js needs looked at.
modified grunt file.js for third party packages and added new sag font files.
Merge with master
added new fonts to fontello for histogram chart interaction.
toggling of widgets broken due to renaming method from hide to toggle. Changed this throughout the project for consistency.
Merge pull request #66 from Kitware/histogram-ui

histogram prep and fixed broken widget toggling.