Minor fix to the documentation.
cmsMake: importation of the task must depend on the PDF statement.
cmsMake: allow the memory usage to be None.
Removed usage of string constants for comp/ev outside of cms.db.

"fail" and "ok" were used throughout the code, now only in
cms.db.submission and cms.db.usertest
Pyflakes run, mostly unused imports.
YamlLoader: when gen/GEN is available, ignore n_input's absence in configuration.
Made WorkerTest slightly better.

Now it actually checks that execute_job was called.
Added some tests for ScoringService.
Avoid crash when ipv6 behaves strangely.
Grading: do not set wallclock_timeout when timeout is 0 (closes: #175).
StupidSandbox: correctly honour wallclock_timeout == None.
Set requests dependency to v1.1
Fix ProxyService

It stopped retrying to contact dead RWSs when the flow of new data in
queue stopped.
Fixes to a couple of recent commits
Add EventSource WSGI handler
Port RWS to gevent
Change a couple of titles in CWS

Make the task name more prominent.
Add a backdoor.
Add OII 2013 to testimonials list
Fix a couple of commands in the documentation

The dash changes the working directory to the home of the postgres user,
avoiding some "could not change directory" errors.