Only show diff it exists.
 Merge branch 'show_diff' into 'master'

Show note diff if diff exists
Fix popen bug in `rake gitlab:satellites:create`

The Satellite#create method no longer sets the `$?` global variable.
Instead, we can use the method return value to test if the satellite was
created successfully
 Merge branch 'fix/rake_satellites_create' into 'master'

Fix popen bug in `rake gitlab:satellites:create`
Add twitter documentation.
Disable connection reaping for MySQL

On GitLab Cloud, MySQL connection reaping seemed to cause more problems
(exceptions and segfaults in the native MySQL client) than it solved.
 Merge branch 'add-twitter' into 'master'

Add twitter documentation
 Merge branch 'remove_reaping_frequency' into 'master'

Remove reaping frequency
Also add example for GitHub.
 Merge branch 'add-github-app' into 'master'

Add github app