First embryo for httpStatusCodeString function
Step: 0.9.0 -> 0.9.0-next
Merge branch 'develop' into feature/http_status_code_string_converter
new names of xsd files
Merge pull request #161 from telefonicaid/feature/http_status_code_string_converter

Feature/http status code string converter
DiscoverContextAvailabilityRequest_test.cpp DONE
Merge branch 'develop' into hardening/unit_test_data_to_external_files
merge with develop