Multisite: Lowercase REQUEST_URI when matching paths.

props markjaquith, jeremyfelt.
fixes #26403.


git-svn-id: https://develop.svn.wordpress.org/trunk@27724 602fd350-edb4-49c9-b593-d223f7449a82
Network Admin: Case-insensitive comparisons for the network-site comparison in the bootstrap.

props jeremyfelt.
fixes #17168.


git-svn-id: https://develop.svn.wordpress.org/trunk@27725 602fd350-edb4-49c9-b593-d223f7449a82
Use Dashicon-style images for mime type icons. Actually moving to Dashicons via the font can be explored later, but has theme/plugin implications and requires too many changes to make it for 3.9. props melchoyce for the icons. fixes #26650.


git-svn-id: https://develop.svn.wordpress.org/trunk@27726 602fd350-edb4-49c9-b593-d223f7449a82