clarified "conflict with verb display"

resolve issue: https://github.com/adlnet/xAPI-Spec/issues/180
updated version # to 1.0.0
updated example signature based on new ver # in example statement
reference Semantic Versioning

Small change to actual requirements, mainly the declaration that we will conform
to Semantic versioning impacts future releases.
Merge pull request #182 from bscSCORM/verbdisplay

clarified "conflict with verb display"
Merge pull request #185 from bscSCORM/compat

Semantic versioning