Combo box selection for branches in trend view
Allow multiple branch selection on trend view page

This allows users to plot multiple trend lines per trend based on
the branch of the submission.
Modernize style of trend jqplot rendering
Remove shadows from markers in trend view plot
Some more style tweaks to trend plot
Merge remote-tracking branch 'origin/master' into tracker-multibranch-plotting
Address QA feedback
Support data click event in multiple branch trend case
Merge pull request #36 from midasplatform/tracker-multibranch-plotting

Tracker multibranch plotting