Messaging View Overhaul

This is the biggest push to date in terms of changes.
The PR addresses 7 issues in the workflow panel:

1. It fixes the conversation height issue, scrolling stops working bug on load
2. Conversation area height is also enlarged
3. It dynamically displays user initials in the conversation area
4. The options panel are hidden on mobile (mobile is conversation only)
5. Back home button has a slightly better styling
6. The conversation shapes are dynamically generated based on the number of participants and their colors

Check them out guys @psybuzz @nikilselvam !
I've actually had a version of CSS transform working, but decided against it. The original reason was that using CSS hover rotate causes the shape to rotate backwards upon leaving. On second thought, I realized that problem can be easily countered by putting the transition on the ```:hover``` effect instead of the parent. Consider it done.