Merge changes from 7.x branch
Issue #2236117, #2083247 patch by sitiveni: Use protocol relative url
Issue #2291289 by er.pushpinderrana: Fix typo
Backport undefined index fix from 7. branch
Issue #2060079 by fortis: Fix request on ajax calls.
Issue #1991940: Fix undefined offset.
Issue #1975502 by Schnitzel: Add support for page visibility.
update browser versions
Initial port for D7
Fixes some bugs
Add settings form
Add module and js files
Initial commit for d6
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