Don't enable /specs route in production

The JasmineRails module is always defined in an initializer, which leads
to an error because JasmineRails::Engine is uninitialized.
Add unicorn
Merge pull request #17 from alphagov/make-app-deployable

Make app deployable
Add plek and gds-api-adapters gems
Add rake task to register routes

The register_routes task will be needed until the point that manuals are
registered as artefacts in panopticon, at which point route registration
can be done from there.
Merge pull request #18 from alphagov/register-routes

Add rake task to register routes
Configure asset host