Added default namespace to schema. refs #8221
Added reference to schema file. refs #8221
Added typo to insert closing quotes. refs #8221
Added default namespace to tags. refs #8221
Merge branch 'feature/8221_schema_version' into develop

refs #8221

Conflicts:
	Code/Mantid/instrument/BASIS_Definition.xml
	Code/Mantid/instrument/NOMAD_Definition.xml
	Code/Mantid/instrument/POWGEN_Definition_2013-08-01.xml
	Code/Mantid/instrument/VISION_Definition.xml
	Code/Mantid/instrument/VISION_Definition_0-20131021.xml
	Code/Mantid/instrument/VISION_Definition_20131021-.xml