Add VISUALIZE link in top nav. Task #35.

Item added to top nav but sill need URL of visualization app.
Add sub items to marine debris box on home page. For #36.
Initial work towards linking records to marine planner. #118
Show two links over marine debris block. #119
Further work towards conditional display of Visualize link. #118
Use JSONP to access geoportal_ids endpoint. #118
Update visualize links to new marine planner. #119
Adjust styling for marine debris link blocks. #119
Only target production marine planner when on production server. #118
Merge remote-tracking branch 'origin/master' into visualize-links
Visualize marine debris link now makes marine debris layers active.
Adding Underscore.js map

To remove a JS error on the page
Adding Grunt, for JS compilation
Adding Underscore.js map to the raw folder too

Missed in the previous commit
Adding Grunt Config for JS minification
Updating instructions for grunt usage
MP-212 Modify Inform page content.
MP-212 Content for marine debris page
MP-212 Content for marine debris page
More grunt config files