enabling plotting of picks in dayplot
changelog
Merge branch 'master' into dayplot_picks

Conflicts:
	CHANGELOG.txt
	obspy/imaging/waveform.py
Merge pull request #547 from megies/dayplot_picks

enable plotting of picks in dayplot
a obspy -> an obspy
Skip empty origins or magnitudes on catalog plot.
Raising warnings if events are not plotted.
Merge pull request #663 from claudiodsf/catalog_plot

Skip empty origins or magnitudes on catalog plot.
pep8
doctest/examples for flinn engdahl
docstring, fixes #629
correct a decorator call (changed in
e54bf7bcf26f3218dcaf42355f74390206fabd)
refactor sonic tutorial plot
docstring
add new ubuntu in deb build script
fix a test
fix image comparison for older matplotlib (see http://tests.obspy.org/10323/#1)
add option to skip flake8 test in obspy-runtests
handle skipping of image tests inside ImageComparison

- fixes http://tests.obspy.org/10359/#1
- removes code duplication
fix segy benchmark image test