fix a bug in Trace.attach_response()
docstrings
fdsn: add option `attach_response=False` to Client.get_waveforms() and
Client.get_waveforms_bulk()
add info on USP fdsn/arclink services
fdsn: docstrings and minimal test for fetching waveforms with response
attached
Merge remote-tracking branch 'upstream/master' into py3k_futurize