Gwpy

Bug-fix for the 0.6 version of GWpy:

- fixed bug in pickling `Channel` in python3 [524]
- improved unit name parsing [526, 531]
- fixed bug in computing Rayleigh spectrogram [528]
- fixed docstring bugs [529]

This fixes an issue with auto-deployment to pypi from travis-ci.org

- fixed error in Q-transform `frange` param [460]
- fixed bug in GPS scaling for plots [461]
- stopped `gwpy.timeseries.io.gwf.framecpp` modifying `Channel` objects in place [463]

- fixed some bugs
- removed support for reading LIGO_LW files into `glue.ligolw` objects [443]
- removed hard dependency on LAL [432, 444]
- modularise multiprocessing utilities [431]
- modifies default plot formatting to better with matplotlib 2 [429]
- reordered FFT-related code to new module [437]

Release notes

- Moved rcParams customisation in `gwpy.plotter` to a new module [410]
- Added parsing of FrEvents from GWF files to an `Table` [416]
- Fixed a bug in handling XML parsing errors when multiprocessing [419]
- Added internal sieving of `glue.lal.Cache` objects in `TimeSeries.read` with `format='gwf'` [421]
- Fixed keyword argument handling in `TimeSeries.read` with `format='gwf'` [422, 423]
- Fixed bug in default plotting of `FrequencySeries` [424]
- Fixes corner-case bug in plotting logarithmic scales [426]
- Miscellaneous documentation improvements

The following bugs were squashed: 418, 412