Various small fixes

See merge request !16

New web UI and lots of fixes

See merge request !15

# Conflicts:
#	zoe_lib/config.py

Various clean-ups and fixes

See merge request !14

Set also the final logo and work on the general web ui refactoring

Fixes for small bugs reported on github

See merge request !13

Log streaming was blocking tornado, fix using thread pools

See merge request !12

Various fixes

See merge request !11

- remove executions with fatal errors form the scheduling queue
- set services to error state when they fatally fail starting
- re-implement log streaming that was not working

Fix elastic scheduler race condition

See merge request !10

The scheduler now checks only for services to be active, not running.
Add a running queue

Roadmap updates

See merge request !9

Internal logs

See merge request !8

If activated, docker will be configured to send service logs to the zoe master, who will save them to disk. Then they can be streamed via the command line or the web interface.

Fix the 'essentials already started' bug

See merge request !7

A service in the undefined state is dead, since it does not exist in the container list generated by the backend.
Add also a column indicating if a service is essential or not in the command line client, to aid debugging.