Add 'notify' field to ReviewInput

To support notification levels for individual reviews with Gerrit Trigger plugin,
add the 'notify' field to ReviewInput class as specified in [1].

[1] https://gerrit-documentation.storage.googleapis.com/Documentation/2.7/rest-api-changes.html#set-review
Add copyright
Merge pull request #16 from chgeo/master

Add 'notify' field to ReviewInput