Improve url exceptions
Add new tests and check to improve wms server
Fix wms server
iRelated to issue #14.
I perform more accurate tests to define if an input request is valid ot
not. I also fix two potential NPEs introduced while reworking the code.
Finally, I fix the sample SLD as it is not valid.
increases the version in order not to face caching issues...
Merge pull request #47 from agueganno/sld-styles

Fix the management of external SLD styles