Previously 'up' brought the panel up, and 'down' brought it down,
which might conflict with expectations on scrolling. Up/down keys
now move the metadata panel to the opposite state, no matter what
the current state was.
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/697
Change-Id: I53079d81042afb86354bf44e9dfd662adf1576cb
The invite animation has been made more prominent and the chevron
is highlighted. this only applies until the user opens the
panel for the first time.
Change-Id: I91d1b9bffaf302890f63b741313aa47cc4beef24
