Removed old/unused theme images
Deleted more old images
Footer changed to "Powered by Sentora"
Changed page title
Updated favicons
Updated login logo
Added new logo to control panel
Deleted old logos
Roundcube footer changed to "Sentora Webmail"
Minor navbar fix

Lineheight is 20px in top navbar but the gravatar image is 22px
therefore it makes the other navbar buttons go slightly out of line.
Removed old Thumbs.db files and added to .gitignore
Moved unlimited.png to img folder
Merge pull request #1 from jacobg830/master

Removed old/unused theme images