emit change event only when actual change

bump version to comply with semver

r0.1.3 Field changes propagate to parent

So computed properties, that depend on object
(or array) are notified when object state changes.

r0.1.4 Propagate changes to parent only for arrays

r0.1.3 Field changes propagate to parent

So computed properties, that depend on object
(or array) are notified when object state changes.

Bugfix because typeof null === 'object'

If JavaScript was more functional than object-oriented,
then typeof null would be 'function' :P

bump version

added 'prop' property to the freak instance

model('aChildContext').prop === 'aChildContext'
model.prop === null

bugfix: clear `children` cache on mutating array operations

bump version