StatusCode rendering in json as standalone message
Tests adjusted
Unit test data file name updated
CHANGES_NEXT_RELEASE updated
Fixed StatusCode rendering for PUT and DELETE Attribute Value Instance
Merge branch 'develop' into bug/225

Conflicts:
	CHANGES_NEXT_RELEASE
Merge pull request #278 from telefonicaid/bug/225

Bug/225
Merge branch 'develop' into bug/convop_metadatas

Conflicts:
	CHANGES_NEXT_RELEASE
Test harness updated with StatusCode responses where apropiate