Fix DATABASE_URL to use default pg port 5432
Update http_client to match docs

https://github.com/ripple/gateway/blob/aa59a69d8c5e08c2c1796efefe099888d5955fba/doc/http_client.md#L20-28
[DOC] Add example json for users endpoint.
[DOC] Add sections in rest.md for all resources.
[DOC] Add endpoint to all sections in rest.md.
[DOC] Add external accounts sample json for GET, POST.
[DOC] Use string for json key.
[DOC] Add rest docs for getting host balances.
[FEATURE] Use new validations, clean up ripple addresses express controller.
[FEATURE] Rename userIndex controller action to index.
[FEATURE] Rename userIndex controller action to index.
[DOC
] Update api docs to not use user/user_id namespace.
[DOC] Add GET ripple addresses example json.
[FEATURE] Recover gracefully if process has already been stopped.
[DOC] Only use REST to refer to ripple-rest repository.
Merge pull request #6 from sublimator/patch-1

Fix DATABASE_URL to use default pg port 5432
Merge branch 'master' of github.com:ripple/ripple-gateway
Merge pull request #5 from sublimator/patch-2

Update http_client to match docs
Merge branch 'master' of github.com:ripple/ripple-gateway
[DOC] Add json example for POSTing new ripple addresses.