reduce update check duration to 10 minutes
Merge pull request #1294 from heroku/update-duration

reduce update check duration to 10 minutes
remove special error handler from addons

these are here for historical reasons; the generic handlers under
Heroku::Command.prepare_run are going to do a much better job now.

more specifically this will make sure addons commands are going to
follow generic auth rules like requesting for 2fa
Merge pull request #1296 from heroku/pedro-remove-addon-error-handler

Remove special error handler from addons
Fixed typos
Merge pull request #1299 from pborreli/typos

Fixed typos
default to http git
disable automatic key uploading