wip: lazy properties for LexEntry and Sense
Merge branch 'master' into feature/liftimport

Conflicts:
	src/models/languageforge/lexicon/LexEntryModel.php
	src/models/languageforge/lexicon/Sense.php
Update composer.json to fetch from LazyProperty fork.
wip: Fix LexEntryListModel to allow for properties that may not exist.
Lift import tests passing.
Merge branch 'master' into feature/liftimport