changing np.array to np.frombuffer to avoid segmentation fault (see #536)
Adjusting accuracy of obspy.taup tests.

See #308.
fixing a problem in setup.py

 - we need to append the util dir at front of sys.path
 - otherwise some other package's version.py (happens e.g. with mlpy)
   can erratically get imported and install fails with an ImportError
add a nice dayplot example with events to tutorial
dayplot: adjust default for subplots lower margin, 0.0 leaves no room at all for label and ticklabels
Merge pull request #536 from megies/536

numpy array from bytearray (in obspy.seedlink)
Fixing issue with event dayplot.

Non-existing preferred magnitudes or not resolvable preferred ids
resulted in a not plotted magnitude value. It now either prints the
preferred magnitude or the first it finds.