chore(release): cut the 2.2.0-beta.0 release and add changelog

chore(release): cut the 2.1.1 release

chore: bump version number and generate CHANGELOG (angular#12247)

docs(changelog): tweak changelog

docs(CHANGELOG): add changelog for 2.0.2

chore(release): v2.1.0-beta.0

chore(release): v2.0.1

chore(release): v2.0.0 proprioception-reinforcement

chore(release): v2.0.0-rc.7

chore(release): bump Angular version to 2.0.0-rc.6 in package.json