add api docs to travis
woops wrong bucket
Run API docs seperately
Replace HTTPClient with Net::HTTP for v2 service brokers.

[Finishes #58211810]
print out the link to the api docs
Set accept header for V2 service broker requests.
Improve API when switching between buildpacks.

Also extend serialization so that it could handle null object patterns.

Refactor buildpacks into first class objects, and move logic of creating staging message to those objects.

Added API test for buildpacks.
Move rspec to test group and clean up the rake tasks that we are not using.
Removed AR connection envs
Fix typo
Added API documention for buildpacks
Added documentation of default delete behaviour to API specs
Added API documentation for posting an admin and remove key from external API
Added API documentation for posting an admin buildpack
Remove unnecessary logging in HM9000Respondent
Auto-merge remote-tracking branch 'upstream/master'