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(was rejecting base64 padding bytes "=")

but disable the widget for non-admins

this variant is closer to the actual meaning
(the fact that the limit was reached does not automatically imply
 that the process is starving, we cannot decide how much memory
 a process needs without doing some profiling)

(will be less confusing, also "done" is more neutral than "success"
 it applies well to past jobs that have errors)

fix #96

fix #55

fix #121

fix #125

- to have SIGTERM forwarded to the process
- to propagate the exit code of the process

(should be less confusing)

to let the task implementations detect that they are being rescheduled

- add a pending task
- add a timeout

(disable_future_warning)

console log level:
 (default)    ->  WARNING
 -v/--verbose ->  INFO
 -d/--debug   ->  DEBUG

log files:
  /vol/log/controller.log   -> INFO
  /vol/log/debug.log        -> DEBUG  (disabled unless -d/--debug or
                               unless env var DEBUG is set)

- add SwarmAbstractionClient: a class that extends docker.Client and
  hides the API differences between the docker remote API and the
  swarm API. Thus a single docker engine can be used like a swarm

- add SharedSwarmClient: a class that extends SwarmAbstractionClient
  and monitors the swarm health and its resource (cpu/mem) and manages
  the resource allocation.
  - resources are partitioned in groups (to allow reserving resources
    for higher priority jobs)
  - two SharedSwarmClient can work together over TCP in a master/slave
    configuration (to allow the production and qualification platforms
    to use the same swarm without any interference)

- the controller is modified to:
  - use SharedSwarmClient to:
    - wait for the end of a job (in place of DockerWatcher)
    - manage resource reservation (LONG_APPS vs. BIGMEM_APPS vs normal
      apps) and monitor swarm health (fix #124)
    - NOTE: resources of the swarm and sandbox are now managed
...

(because rails requires these files/directories all the time)

- rename DOCKER_USER as DOCKERUSER (docker-compose seems to fail with
  varnames containing underscores)
- remove quotes

prepare.sh now needs to be sourced only once (when bootstrapping
the containers)