Preserve list position on leaving/joining session
added the video on the how-to-unhangout page
Change text of session JOIN buttons

Also, fix some tests (#267)
Merge branch 'video' of github.com:drewww/unhangout into list-position
Pre-scale how-to-unhangout images
Update LCL listing and date on index
Refactor create-hoa test to avoid timing failures (#267)
Merge pull request #310 from drewww/list-position

List position