Allow to handle settings collections
Add /settings/ssh_keys API
Use travis-core from ps-settings-encryption branch
Remove debugger from Gemfile
Fix specs
Special case for settings in rewrite is not needed
Bump travis-core
Params in POST and PATCH requests should be fetched from request body

This also adds missing specs for ssh_keys endpoint
Bump travis-core and use master branch
Don't error out on settings

We didn't have scope: :private specified on settings endpoint which
resulted in errors (services check permissions of current user anyway,
but it will error out if there is no user available).
Merge pull request #117 from travis-ci/ps-ssh-keys

Add ssh keys to settings API