* Added hip chat on branch.
* Simple slack integration works.
* Use integration ID rather than service name so we can have multiple integrations of the same type per project.
* Support looking up integration fields using integration_id
* Bumped version number for breaking update.
Merge remote-tracking branch 'origin/master' into APP-720-multiple-integrations-per-product

Conflicts:
	Gemfile.lock
	lib/aha-services/version.rb
* Added captions for all integrations.
Merge remote-tracking branch 'origin/hipchat' into APP-720-multiple-integrations-per-product
* Hipchat integration is working.
Merge remote-tracking branch 'origin/slack' into APP-720-multiple-integrations-per-product

Conflicts:
	Gemfile.lock
Merge branch 'APP-720-multiple-integrations-per-product' of github.com:aha-app/aha-services into APP-720-multiple-integrations-per-product
* Starting on HipChat documentation.
Merge branch 'APP-720-multiple-integrations-per-product' of github.com:aha-app/aha-services into APP-720-multiple-integrations-per-product
* Removed instructions about clicking "Create integration" since that is no longer necessary.
* Added Slack documentation.
Merge pull request #12 from aha-app/APP-720-multiple-integrations-per-product

App 720 multiple integrations per product