Merge pull request #501 from isuftin/master

Splash/Help updates, dependencies, session zoom override, categorical search
Merge pull request #502 from isuftin/master

Ajax request change cursor, legend fixes, modal intro window, canned views, mousewheel functionality
Merge pull request #503 from isuftin/master

Implemented geospatial filtering post-search on front end
Merge pull request #504 from isuftin/master

Resizing fixed for down to min-width - works with new icons
Changed historical view to new URL
Added new images for toolbar