switched in new image for data discovery
first attempt at making smaller icons for showing all tiles
Changed timeout to 1 hr and polling frequency to 5 sec
* infinite is not possible without reworking the wpsclient some
* change to 5 second polling is to cut down on requests
* I ran a long period which took 9 minutes, so that at least did it
Moved external link icon to within anchor
Added spinner
* also fixed spacing issue
Merge pull request #56 from jiwalker-usgs/master

Tile changes