add WMS GetCapabilities parser for WMS 1.1.0, 1.1.1, 1.1.1 WMS-C profile and WMS 1.3.0
make Travis build pass again
add an example
use namespace URI instead of prefix as suggested by @tschaub and discussed with @ahocevar
Merge pull request #180 from bartvde/wmscapsclean

add WMS GetCapabilities parser for WMS 1.1.0, 1.1.1, 1.1.1 WMS-C profile