Search selector

[pdclark]

"Git" should probably be added as an option to the search drop-down selector. Another option would be to show Github items inline with wordpress.org responses, but that might get confusing, even if they have different stylization.

[pdclark]

• Add headers to select menu for github.com and wordpress.org
• Add github option to search within username
• Disable star filter if username selected