New helper function.

Added a new helper function converting a vector of unit length given in
dip and azimuth to a unit vector in the vertical, south, east coordinate
system.
Added arbitrary dip/azimuth rotation.

Added a new function that allows to specify the orientation of each
component seperately with dip and azimuth. The components do not have to
be orthogonal to each other it should work nonetheless. The output are
three new arrays, always oriented Up, North, East
Added rotate2ZNE method to obspy.xseed.parser.Parser

This enable the (very basic) fully automatic rotation of arbitrarily
oriented components to ZNE. Also renames the channels.
Added test for the Parser rotation method.
Added test files.
Updating changelog
Better docstrings.
Merge branch 'master' into rotations.

Resolved conflicting CHANGELOG.
decorator to add processing information to trace in a more general and
standardized way
use new decorator to add trace processing info
fdsn: add neries/seismicportal url mapping
Test case for issue with global state in obspy.taup.
Correcting docs (based on sphinx output)

see #725 and http://docs.obspy.org/master/log.txt
Catch all non-200 return codes.

We already catch all return codes that are defined by the FDSN standard.
This also catches some others that might slip through.
Merge branch 'releases'
Reset some variables in taup when loading model.

This allows multiple calls to not trounce each other's data, eventually
resulting in completely incorrect results.

Fixes #728.
Merge pull request #728 from krischer/taup_fix

Calling `obspy.taup.taup.getTravelTimes` repeatedly eventually fails.
Merge branch 'releases'
changelog for #728
Merge remote-tracking branch 'upstream/releases'