Update travis-core to get Metadata changes
Add GET /jobs/:job_id/metadata endpoint
Add PUT /jobs/:id/metadata endpoint
Update travis-core to get newest metadata changes
Rename metadata => annotations
Update core to get metadata->annotation rename
Merge branch 'master' into hh-add-metadata-endpoint

Update Gemfile.lock to point to the updated travis-core PR

Conflicts:
	Gemfile.lock
	lib/travis/api/app/endpoint/jobs.rb
	spec/integration/v2/jobs_spec.rb
Merge branch 'master' into hh-add-metadata-endpoint

Conflicts:
	Gemfile.lock
Fix links to docs and blog in API doco.

[skip ci]
Require status for updating Annotation and bump travis-core
Point travis-core to ref that works
Bump travis-core
Bump travis-core
Bump travis-core

Includes a recent merge
Merge pull request #67 from travis-ci/hh-add-metadata-endpoint

Add annotation endpoints (#1220)
Respond with 409 to POST '/users/sync' if sync is in progress

Fixes travis-ci/travis-ci#1659.

[Henrik Hodne: squashed commits]