Merge pull request #6 from kartikm/master

Do not include unneeded files in XPI
Added support for Whonix and improved preference handling code
Change panel positioning and fix setIntPref for custom settings
Merge branch 'master' of github.com:ioerror/torbirdy
Update the ChangeLog
Clear the HTTP and SSL proxies (if set) when TorBirdy runs
Update translations (torbirdy.dtd)
Update translations (torbirdy.properties)
Ensure Whonix respects Enigmail preferences (the same as Tor)
Merge pull request #7 from kartikm/master

Fixed Makefile to (really) not include TODO/ChangeLog files. Added clean target.
Merge remote-tracking branch 'upstream/master'