Added usgs and epa logos.

Refactored CONFIG to provide multiple attributions. Updated uses of the attribution constants in code.

Attribution popup displays multiple logos.
Killed Dygraph memory leaks
Merge pull request #48 from cschroed-usgs/dygraphMemoryLeakFix

Killed Dygraph memory leaks
Merge pull request #45 from cschroed-usgs/3logos

Added usgs and epa logos.
switched from color name to hex
Merge branch 'master' into gageInfo

Conflicts:
	glri-afinch-web/src/main/webapp/js/Map/map.js