LICENSE: Fixes typo BDS -> BSD.  Closes #1589
Make it more prominent that MongoDB,SQL,SQS, etc transports are experimental
Group/Chord.apply_async no longer starts separate task, also fixes many canvas bugs.  Closes #1120
Updates docs after group.apply_async change
Always pass app to maybe_signature
Remove left-over print statement
Workaround for Unicode errors (Issue #427)
Set default encoding file from logger handler.  Closes #427
Fixes in NameError in app.log
Fix for #1150 by sharing non-abstract custom task classes between apps
adding on_loop_stop signal and test
adding self to contributors
using api for worker_process_shutdown signal. documenting it
test passes individually, added docstring