Remove secret_key config, not needed with the cookie session

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Remove session creation and unused session checks

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Adapt unit tests to reflect recent changes on Payload-Checksum

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Remove cookie session code (closes #339 #330)

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Cleanup some unused deprecated to secret_key

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Cleanup old references to secret_key

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Merge pull request #351 from dotcloud/remove-cookie

Remove cookie (flask.session)
Add submodules
Move away content from __init__ to let namespace
Add external requirements
Declare namespace
Fork tox requires for now
Fix namespace
Tox in progress
Redis and swift are now provided by core and swift client
same
Replace tox by toxic script for now
Use straight folders
Exit submodules
Editor goodied

+ editor config
+ sublime project