Version Changes Restore (ish) and Verb Fixup from Issue #444

#444 on the verb side, still in a bit of a pickle with the versioning within Statements.  As you can see, we have both 1.0.0 requirements and 1.0.1 requirements.  I think updating all of these to 1.0.3 is premature, but can we really leave them half and half?  I propose updating all to 1.0.1.  Big question - does this break any actual implementations, or was this something the LRS providers didn't follow because it seemed illogical?
It's the actor in this requirement that I object to. 

How about: ```A single Verb IRI MUST be be used to refer to multiple meanings.```

On another note, is this going to clash with https://github.com/adlnet/xAPI-Spec/pull/529/ ? Feels like we're both working on similar requirements but in different places.