WV-793: Fixed arctic proj4 definition which was preventing the demo from
working on Chrome.

Upgraded Leaflet to 0.7.2 and Proj4Leaflet to 0.7.0. Versioned library
directories.

OpenLayers 2 demo was incorrectly using proj4-2.0.0. Switched to using
proj4js-1.1.0.

Links to source now use the release branch.
Send headers to tell the client to always revalidate
Updated README with new library versions and proj4js correction
To version 1.1.0 and updated response headers
Added Web Mercator
Leaflet no longer fetches tiles out of range, updated to REST style
Added OpenLayers 3 examples
Removing old files
Minor formatting error
Updated README
Removed debugging files
OL2 and OL3 now together
Added OpenLayers 3 endpoint