Fixing bad options bug and adding better error checks
Merge branch 'master' of github.com:serby/save
Bumping version
Ensure falsy ids don't count as being a defined id in memory engine.
Merge pull request #6 from domharrington/falsy-id-fix

Ensure falsy ids don't count as being a defined id in memory engine.
Adding extra find test
Allowing null idProperty in create
Merge branch 'master' of github.com:serby/save

Conflicts:
	lib/memory-engine.js
	test/engine.tests.js
bump
delete no longer requires a callback
delete throws error if callback is not a function
Linting
Adding lint config