Update to favicon

Updated the favicon to remove the black corners
Remove sparse from Vegetation Type Category

"scientists changing their mind. Or rather choosing mind over model."

https://trello.com/c/sQKF9XuN/47-heads-up-remove-sparse-from-the-vegetation-type-category
Merge pull request #2 from mhines-usgs/master

Update to favicon and vegtype input. 

Looks good. I'll work on getting this deployed.