fdsn: add neries/seismicportal url mapping
Test case for issue with global state in obspy.taup.
clear message if numpy is missing at install time. closes #730
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.
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.
changelog for #728
obspy-plot: use AGG backend if direct output to file is specified
improving Beach docs, closes #733
fixes broken links add Tsuboi2004 to citations (fixes #731)
fixes parsing WADL of seismicportal.eu (fixes #727)
correcting filter docstrings

closes #723
adapting timeout and error message for fdsn.client

thx to Chad:
http://lists.swapbytes.de/archives/obspy-users/2014-February/001200.html
whitespace in SLClient.multiselect are stripped now (fixes #708)
fixes #680
extend remove_response for polynomial responses
changelog for polynomial response correction

* see a6c5593c84b6a4a79d90a9eed7dae4edabf43727
* see #566
Merge pull request #727 from obspy/fdsn_seismicportal

seismicportal.eu FDSN WADL files cannot be read
avoid exposing some unwanted objects in __init__.py files
Finally fixing plots.

Furthermore the default linewidth is now 1 and the grid is deactivated
for normal plots.