arclink: check times in getInventory on channel level instead of
location level (i.e. on downmost level). this can help with faulty
location specifications around OK channel specifications. (see #586)
Added compressed PPSD saving; added loading
Numerous improvement to the event plotting.

* Plotting just a single event now supported for all projections/color
  encodings.
* Color encoding now defaults to the event depth.
* New colormap for the event depth encoding.
* Now uses the preferred magnitude and origin if available.
* Colorbar hidden for single events.
* Adjustments to the map colors for better visibility of the events.
* Some bugfixes and workarounds.
Plotting of record-sections added
PEP8 cleanup
Update credits.rst (#598)

- 'Contributers' --> 'Contributors';
- Added a few new contributors from https://github.com/obspy/obspy/graphs/contributors ;
- Still need to figure out the actual name of some of the remaining unlisted contributors.
Update credits.rst (#598)

Also crediting Peter for his work on ObsPy wiki.
Update credits.rst (closes #598)

This should close #598.
Waiting for new contributors to come!
Added example script and brief tutorial, filed suggestions
Fixed Typos
Merge pull request #601 from miili/master

Plotting of record-sections added
Update credits.rst
Updated credit.rst
Updating credits.rst
adding obspy.css to docs
PEP8 and correcting "Seconds [s]" to "Time [s]"
improving coverage of obspy.core.stream
fixing duplicate test entry
adding coverage configuration file
renaming coverage.rc to .coveragerc