qml: refactor default namespaces
qml: trying a simple way to enable custom additional tags (working
commit)
qml: correcting skipping present namespaces
qml: changing structure of additional info

pick.additionals: AttribtDict with field names as keys and dicts
containing "value" and "namespace"
qml: allow custom namespaces with and without given abbreviation. use

default obspy namespace when no namespace is given. currently looks up
fields in an AttribDict called obj.extra. Currently for pick and event
only.
qml: Added support for attributes in extra
fix some bugs in setting float-derived fields in stationxml

.. more of those in there for sure :(
Merge branch 'releases'
another minor fix in stationxml IO
minor fix for stationxml IO
Dealing with strange seg2 files.

It now strips all non printable characters. This should work in
all cases.
Merge remote-tracking branch 'upstream/releases'
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)