Add a test for --realtime.

Unfortunately Klein does not provide an API surface for reaching into
these objects and inspecting them, so we have to use patch() to catch
the reactor on its way in to the application.
declare the relevant flag
add the flag
lint
Merge pull request #102 from rackerlabs/realtime

Add a --realtime flag.
new version for realtime feature
Add Fastly plugin.
Add Fastly plugin
Mimic Fastly
Mimic Fastly endpoints
Update Fastly responses
Add Akamai MIMIC
 Remove global variable.
Merge branch 'akamai' of https://github.com/malini-kamalambal/mimic into akamai