Cleaned up admin icon CSS.
Merge pull request #1361 from themeblvd/master

Cleaned up CSS for admin Download icons.
Add license tab - issue #1105
Merge pull request #1363 from ghost1227/bugs/1105

Add license tab - issue #1105
Merge branch 'master' into release/1.7
Merge branch 'release/1.7' of github.com:easydigitaldownloads/Easy-Digital-Downloads into release/1.7