Adding test data for css format support in obspy
css: starting some work on testing and adding reference schema pdf
- some old CSS python readers; there are multiple versions of the CSS
  format, css28fix covers only version 2.8 using integer values; css2asc
  also covers float values in the binary files
correct mapping of data type strings
css: not-zipped test data again

the filename is specified by the css header file, so it probably makes
more sense to leave it not-zipped. would require hacking around that
otherwise, better avoid that.
css: general module setup
css: isCSS method + basic test
css: changelog message already ;), otherwise it might be forgotten
css: waveform plugin entry point
css: reading CSS waveform files + tests
css: adding missing __init__.py for tests
workaround for "block" kwarg on matplotlib < 1.0

see #501
Merge remote-tracking branch 'upstream/master' into css
Update setup.py

writeFormat for CC does not exist
css: fix a failing core test

 - prevent empty files from being recognized as CSS
 - also test this in the module
Merge pull request #504 from isbreen/css

CSS (Center for Seismic Studies) format
add cwt example to tutorial using ObsPy's cwt

@martinvandriel can you please double check this?
addign missing file for previous commit
- correcting comments
correcting an error in the docstring