filter our general availability features in labs display
initial settings command, copied from labs
FEATURE -> SETTING
feature -> setting
Feature -> Setting
labs -> settings
Copy. Remove references to experimental features
only display "general" app settings
still need to use api.delete_feature or api.post_feature
remove WARNING
setting -> feature
settings.rb -> features.rb
only list app features
always preauth
Merge pull request #1220 from heroku/always-preauth

always preauth
v3.11.3
Merge pull request #1213 from heroku/settings

Features
unique warnings before output
Bump Excon to 0.40.0
Merge pull request #1225 from heroku/brandur-bump-excon

Bump Excon to 0.40.0