Merge pull request #257 from bhariharan/unstable20

Explicitly revoke refresh token upon logout
Replace login URL with instance URL to prevent redirection
Update shared commit
Merge pull request #259 from bhariharan/master

Update shared commit
Merge branch 'master' into unstable
Merge pull request #260 from bhariharan/unstable

Merge 'master' into unstable
Merge branch 'unstable' into unstable20