first pass
wait, doing this wrong
WIP, needs discussion
little bits
Added Datetime property to handle transforms
Use Datetime prop for validation, serialize after
add note for ValidationError
Merge remote-tracking branch 'origin/master' into feature/Range1dDatetime
in merging docs, only merge new objects
Merge pull request #748 from ContinuumIO/hotfix/load_document_performance

in merging docs, only merge new objects
Merge pull request #717 from ContinuumIO/feature/Range1dDatetime

Feature/range1d datetime
Added dependency check for example subdirectories.
Merging master