Merge pull request #2649 from awesomerobot/master

heatmap/coldmap should stay red/blue despite theming
ES6: `grouped-each` helper and moved event dispatcher to an initializer
I hate hearts, I HATE LOVE
Prevent deleting the static page doc topics
PERF: Only delete 100 inactive users at once
FIX: users are 'active' by default in imports
c'mon, unhide? Show, baby, SHOW
Update INSTALL-digital-ocean.md
Update image for install guide
Merge pull request #2651 from techAPJ/patch-5

Update image for install guide
fixed a spelling benchamarking -> benchmarking
FIX: work better if there is only one LoginMethod

If there is only 1 login method and local logins are disabled
take user directly to the login provider
Merge pull request #2652 from akshaymohite/new_discourse_branch

fixed a spelling benchamarking -> benchmarking
FIX: avatar_url should only be a custom field
fix TOS/welcome sections of Admin Quick Start
make keyboard shortcut help 3 columns vs 2
improve keyboard shortcut help layout
hide sign up button from header on mobile
curse you misaligned semicolon
swapping around heatmap low/high