link and feed made for help page
Handling nulls properly when creating pie chart. Ready for testing. 

This commit also includes a reversion of a mistake I made in combining
the CSS for all media queries into one section in the CSS. I've
separated the CSS per query again, working back from history.
Added jasmine specs for new legend creating functionality
Merge branch 'NAWQAAN-312' into NAWQAAN-288
Added close link and am making sure to close any previously shown pie
charts in the map it's supposed to go to before putting a new one up
Merge pull request #216 from isuftin/NAWQAAN-312

Handling nulls properly when creating pie chart. Ready for testing.
Merge pull request #215 from mwernimont/help_page

link and feed made for help page
Added a shutdown call for when pie charts are being removed
Merge pull request #217 from isuftin/NAWQAAN-288

Added a close button to the legend to close pie chart