Dealing with strange seg2 files.

It now strips all non printable characters. This should work in
all cases.
Merge remote-tracking branch 'krischer/seg2_fix' into releases
clean up after lion :P
Fix links to Mini-SEED information.
Fix links to XML-SEED documentation.

The page numbers also appear to need an update. I think these are the
correct ones.
Fix SEED links in documentation.
Merge pull request #746 from QuLogic/seed-weblinks

Fix SEED weblinks
update credits

thanks for reporting problems and helping with fixes @QuLogic!
Merge remote-tracking branch 'upstream/releases'

Conflicts:
	obspy/seg2/seg2.py

not sure if I put the decode at the right place in seg2.py while merging
for python3.. (@mbyt, @krischer)
Python 2 and 3 compatibility for 90bcc3a44ec1430b4.