Add Vlad.
Vlad-based deployment for a single server.
Don't define development tasks if prerequisites aren't present.
Database configuration for production.
Environment variable values should be strings.
Fix path to test logins.
Enable X-SendFile for Apache.
Account for process forking when starting actors.
Accept configuration from Aker and bcdatabase files.
Don't load Vlad when loading the Rakefile.

This prevents two problems:

1. Configuring Vlad at Rakefile load time causes rake devenv invocation
   to fail: environment variables required for deployment (e.g. DOMAIN)
   cannot be expected to exist when starting up the development
   environment.

2. Something inside Vlad is defining a top-level source method, which
   interferes with irb applications (i.e. the Rails console).
Split up file and environment-based configuration.
Guard against missing Redis configuration.

(This is an argument to not connect on boot.)
Juggle around authority setup.

Reason: When authorities are present in an Aker.configure block (which
is what config.aker eventually passes its block to), the authority
initialization process starts.  Part of the initialization process for
the CAS authority involves checking whether required parameters are
present, which means that we can't install required authorities until we
know where our parameters are coming from.
Gank Cases' Sidekiq startup script.

Useful for NUBIC's deployment.