Done using isort[1], with the following command:
```
isort -rc ./app ./tests
```
Adds linting to the `run_tests.sh` script to stop badly-sorted imports
getting re-introduced.
Chosen style is ‘Vertical Hanging Indent’ with trailing commas, because
I think it gives the cleanest diffs, eg:
```
from third_party import (
lib1,
lib2,
lib3,
lib4,
)
```
1. https://pypi.python.org/pypi/isort
We're no longer using user-provided services for application secrets
so we can remove the cloudfoundry_config code responsible for parsing
VCAP_SERVICES.
previously in run_app_paas.sh, we captured stdout from the app and
piped that into the log file. However, this came up with a bunch of
problems, mainly that exceptions with stack traces often weren't
formatted properly, and kibana could not parse them
instead, with the updated utils library, we can use that to log json
straight to the appropriate directory directly.
pass in the base URL - if not set in the environment this is set to
localhost, but on paas we can pull this out of vcap_services so that
letters render properly on paas
