add dated filel; ecrm.owl should always be /current

Filename ecrm.owl is not dated so the namespace inside shouldn't be
dated.  Using git tags is a bad idea, they're for merging dev efforts
not using different ontology versions. My scripts work only for /current
added rdfs:labels

added rdfs:label to each class & property. used ecrm-labels.pl. Mark
says Protege will remember them, so this needs to be run only only once
added 2 application profiles

ecrm-inverse.owl, ecrm-inverse-transitive.owl
scripts for generating labels; application profiles
added README

someone who groks Markdown, please prettyfy this with some headings