adlnet/xAPI-Spec — pull request #567 by garemoko (2014-12-18 11:42:47+00:00)
Title: Removes the ambiguous word "blank" in 3 places.

Fix https://github.com/adlnet/xAPI-Spec/issues/471#issuecomment-67382428 as agreed on yesterdays call.

Also addresses two other occurrences of the word "blank" in the spec.

Also tidies up some lowercase shoulds around timestamp and authority.