Merge pull request #13 from DeOb/master

Version numbering, Licence file etc.
Merge pull request #14 from DeOb/master

Firefox extension: remeber tab share state
Merge pull request #17 from DeOb/master

Fix
Merge pull request #20 from DeOb/master

Disable https option
Added option to disable https. Fixes #18.
Fixes #16.
Merge pull request #22 from DeOb/master

Release version
Merge remote-tracking branch 'upstream/master'
Updated license file.
Merge pull request #21 from jbreitbart/master

Two fixes
Correct version numbering