Fix east migrations adapter path when npm modules installed elsewhere.
Increase number of seconds processes need to stay running in supervisor.

This is to try to better deal with some of the slower processes if they
begin to fail and restart.
Run in production mode by default. Generate secret tokens for rails app.

Since the omnibus installer won't ship with development resources, we'll
default to production mode. development mode should really only be used
during the actual development of API Umbrella (and not just if you
happen to be running API Umbrella in front of your development stack).
Fix mime type of static file serving from the web app.

Previously, this was causing the compiled rails assets to be served up
as text/plain when the rails app was running in production mode.
Fix some nginx redirect issues.