Merge pull request #23 from mkaply/master

Fix print button
Merge pull request #24 from mkaply/master

Use print preview instead of print, to be consistent with the button action with chrome=webconverger
Merge branch 'master' of https://github.com/mkaply/webconverger-addon
Merge branch 'master' of https://github.com/mkaply/webconverger-addon
Merge branch 'master' of https://github.com/mkaply/webconverger-addon
Merge pull request #25 from mkaply/master

New whitelist preference, extensions.webconverger.whitelist
Fix #28
Merge branch 'master' of github.com:Webconverger/iceweasel-webconverger
Allow certain about pages