first work on vocabulary concepts for apps4eu, adding more metadata and stuff

 * Add a lang tag (e.g:@en) for the labels and comments.
 * Remove the '#' in the URI of the vocab, like in [ [] rdfs:isDefinedBy <http://apps4europe.eu/vocab/odapps#> ]
 * Define odapps:AppConcept rdfs:subClassOf frbr:Work ? (see: http://vocab.org/frbr/core.html#Work)
 * Remove xsd:string in the range of odapps:consumes ?
 * Rename odapps:revision to odapps:revisionOf as suggested by the label? And maybe create an inverse property odapps:revision ? Actually, I don't understand this property. Is it related to the versioning (like in prov:version http://www.w3.org/ns/prov#Revision) or a number indicating a different version of an Application (like in radion:version) ? (seehttp://www.w3.org/ns/radion#radion:version)
 
* Properties addings [ not sure if this make sense ]

	odapps:implementation rdfs:subPropertyOf frbr:realization .
	odapps:implementationOf rdfs:subPropertyOf frbr:realizationOf .

	odapps:Application odapps:implementationOf odapps:AppConcept .
	odapps:AppConcept odapps:implementation odapps:Application .