add landscape.io badge

code health https://landscape.io/github/xmlrunner/unittest-xml-reporting
add requires.io badge for requirements.
add license badge :+1:
MOAR badges.
prepare next development version (1.9.3)
add non-ascii tests - improve to_unicode function

The hardcoded utf8 isn't really nice but that was already the case...
Change runner default encoding to saner utf8