Merge pull request #2057 from awesomerobot/master

adding basic :focus style in for buttons in Firefox
Merge pull request #2058 from awesomerobot/master

modifying user profile to better support image backgrounds
Remove empty SCSS rules
Merge pull request #2059 from nschonni/remove-empty-rules

Remove empty SCSS rules
Remove units for zero values

Units are ignored for zero values in CSS except for a few edge cases.
Merge pull request #2060 from nschonni/remove-units-for-zero-values

Remove units for zero values
Use for loop to shrink bbcode

Dry out the long set of similar selectors
Strip tabs from sheets
fix translate mistake

Line 626
minor change : favourite > starred
Merge pull request #2063 from CirnoKaster/patch-1

fix translate mistake
Merge pull request #2061 from nschonni/use-loops-for-bbcode

Use for loop to shrink bbcode
BUGFIX: topic specs were dependent on Time.now

which would fail when DST was around
Add test to ensure creation of like notification in a PM.
Merge pull request #2056 from vikhyat/pm-likes

Don't suppress like notifications in private messages
FEATURE: Allow `customHTML` helper to resolve to a template if it
exists.
Add Dismiss Read to mobile view
FIX: We should use partials when rendering but keeping the same context.
Update onebox gem to fix stackexchange URL issue
Add site name to beginning of backup filename
Refresh the site after updating certain site settings