Fixing tutorial code snippet
Fixing issue with datetime object on older systems
Commenting arg/restype for debugging function.

Is it not needed to run ObsPy and only useful for debugging.
fix a doctest
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
Fixing FDSN doctests.
Added MANIFEST.in.

Setuptools and numpy.distutils do not play nice with each other. The
file is needed for working source distributions.
deb: add python-mock in "recommends"
Include the RELEASE-VERSION file in MANIFEST.in
some minor fixes
some bugfixes in station objects

equipments are always optional, just do nothing if None. fixes #710.
correct Channel.calibration_unit(s).
all resource_ids are optional, pass on None.
fix frequency range group output.
clarify CHANGELOG, next version in branch releases will be 0.9.1
add GFZ fdsn node in url mapping/docstring
smart calculation of nfft in Trace.remove_response

in case large primes are encountered in nfft factorization (which makes
the computation take forever) we simply switch to using the next power
of 2, which is not the fastest possibility but has robust computation
time.
exclude obspy/lib/*.py from flake8 code check

closes #716
nfft: try to avoid going up to power of 2, try out some slightly larger
values before that