Update the Boat and Boat Mini URLs
Update image generator script

Make images generator script work even when it's executed from outside
of the `bin` directory.
Add Dolphin Zero logo

Ref: http://dolphin.com/?press=announcing-dolphin-zero-the-first-ephemeral-mobile-browser
Add old Dolphin Beta logo

The Dolphin Beta logo is history as Dolphin is now using the
Android Market Beta Testing program, and therefore, the logo for
the beta version is the same as the one for the stable version.

Ref: http://dolphin.com/beta/
     https://support.google.com/googleplay/android-developer/answer/3131213?hl=en
Update Epiphany URL
Update Exsoul logo