Miro 1.2

# On Windows and Linux, we updated to XULRunner 1.9, which brings memory and performance improvements.
# We've added a much-requested preference to set new channels to not auto-download.
# New preferences for tweaking number of simultaneous auto-downloads and torrent seeding.
# Important re-architecting of the frontend and backend code.
# Lots of bug fixes and tweaks.
# On OSX, we updated to Perian 1.1.
# On Windows, the Miro installer is now much simpler and prettier.
# Improved support for Flash in Channel Guide pages.
# Improved translations for dozens of languages.