Fix the incorrect parsing of utf8 in wof

Fixed the parsing of czech and international characters from CUAHSI
WaterOneFlow service by using utf8 encoding
Merge pull request #91 from jirikadlec2/fix-czech-characters

Fix the incorrect parsing of utf8 in wof
bug: using a subset of parameters when parsing GSOD is broken; fixes #92
includes a test case
add note about bugfix to changelog
release version 0.7.3
bump to next dev version: 0.7.4-dev
Merge branch 'master' of github.com:ulmo-dev/ulmo