chore(changelog.js): pickup breaking changes f/ chore/refactor commits
chore(mocks): remove obsolte createMockWindow api

we never released this api, so it's safe to remove
docs(CHANGELOG): release notes for 1.2.0-rc1 spooky-giraffe
chore(grunt): support RCs in version numbers
chore(release): cut 1.2.0rc1 spooky-giraffe
docs(CHANGELOG): update changelog