Correct import in security docs.
Update AbortableTask docs.  Closes #1993
Worker --detach must forward working_directory option.  Closes #2003
Fixes bugs with bootsteps: requires attribute not inherited by subclasses and using module paths did not work properly.  Closes #2002
Fixed wrong arguments
Fixes tests
Remove python3.4 travis fixups (it's preinstalled now)
non-string dict keys in django-celery configs

This fix allows celery-flower to not have problems displaying
configurations for projects that still use configurations embedded
in django settings files.  In this instance there are some int
dict keys that are totally unrelated to celery but that are causing
frequent error messages in the celeryd logs.
Adds stats for eventlet pool
Fix handling of non-string keys in filter_hidden_settings
Merge branch '3.1' of github.com:celery/celery into 3.1
Updates system configuration
PromiseProxy: Only remove original object if evaluation succeeded
Multi: stopwait was not in usage
Fixes weird traceback issues with connection_or_acquire + producer_or_acquire
Make empty ResultSet support get()
Cosmetics for #2041
Tests passing
Fixes duplicate nodename warning.  Closes #2046
Worker --detach default workdir is now CWD