workarounds for ETHZ FDSN node
more workarounds for ETHZ FDSN WADL differences
More fault tolerant parsing of the WADLs.

This should enable the parsing of most WADLs even if they are not fully
conforming to the standard.
Changes to WADL parser.

I tried to come up with some logic that should make it possible to parse
a large variety of WADL files with slight deviations.
test cases for parsing parameters from all real world application.wadls currently served out there
Merge pull request #702 from obspy/fdsn_ethz

fdsn with eida