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
running futurzize on obspy.core

cmd line arguments:
futurize -0 -w .
py3k utcdatetime: encoding + small neg intergers
py3k utcdatetime rounding workaround
doctest print adjustment utcdatetime
Py3k: casting __radd__, incompatible future int
Py3k refactoring to obspy compatibility module
Py3k compatible attribdict
Py3k: making base and setup.py compatible
Py3k: Increasing compatibility of stream and trace
Py3k: ascii doctests are now compatible