Specifically:
* Add and style the sidebar toggle button to the header and remove the
gravatar.
* Add the logic for retracting the left side bar.
* Modify the logic for clicking on the referral pane to prevent it from
closing the sidebar.
* Modify the logic for clicking on the stream filters to prevent them
from closing the sidebar.
* Modify the logic for clicking on the stream settings dropdown and the
user info dropdown to prevent them from closing the sidebars.
(imported from commit 73e00eb834a6e87cb8d659fdcf6c2e06fff3731d)
* We now clear the validation errors when the input box is de-focused
* We make the left sidebar height accommodate the validation error messages
(imported from commit 4b39bfd3e8e8dd707722492a3f98967ee4ccf0ab)
For now, we just get emails about referrals that we have to follow up
on manually.
I don't love using the name "referral" in some places and "invite" in
others, but we already use the verb "invite" to mean something else
and "invite" is a canonical noun.
(imported from commit 0814c18395952fcdef234c1584984f71ca1b6f37)