Merge pull request #272 from telefonicaid/feature/conv_put_attribute_no_valueid

Feature/conv put attribute no valueid
fixed the bug described in issue 277
fixed a unittest bug - payload files are now closed after being read
Merge pull request #281 from telefonicaid/bug/too_many_open_files__during_unittests

fixed a unittest bug - payload files are now closed after being read
CHANGES_NEXT_RELEASE
CHANGES_NEXT_RELEASE
Merge pull request #280 from telefonicaid/bug/issue277

fixed the bug described in issue 277
Merge branch 'develop' into bug/225

Conflicts:
	CHANGES_NEXT_RELEASE