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.
Make FileCacher.delete raise a KeyError
Make FileCacher.get_size use the local copy
Update ParameterTypes

Add default values and a way to get a JSON description.
Add Watcher
Rewrite AWS
Initial setup of cmsPracticeWebServer
Now accessing / outputs index.html instead of a 404 error.
Initial import of PWS template; minor fix in PWS.py
Fixed PWS and setup.py to use the new 'assets' folder