Add test images for dayplots.
Fix crash when plotting events on dayplots.

event.picks only exists if event is downloaded from neries. If event is
just a dictionary of time/text, then it shouldn't be accessed.
Add more events to day plot test.

These don't currently work. The events are placed on the wrong line.
Add dayplot test with a catalog.

Also broken for same reasons as previous commit.
Updated reference images for dayplot tests.
Modify dayplot test to trigger other bug I found.
Fix rounding bug breaking previously added test.
Fix some typos in docs and comments.
Merge branch 'master' into dayplot-tests
Merge pull request #767 from QuLogic/dayplot-tests

Dayplot error when giving the events argument
travis: use pyyaml wheels from wheelhouse
fixing fdsn test suite
forgot to update version number for fdsn event service
commit 76b4092 added fmin which is not defined for MFC - also fixes #834
More defensive __str__() method for responses.

While strictly speaking not valid these responses do appear in the wild
and ObsPy should not crash when trying to print them.

Also removes an obsolete warning.

Fixes #736.
AH (Ad Hoc) waveform format read support
typo
Fixing failing doctests related to 75f1cd05d8b792.
typos
adding obspy.ah to changelog