Created the "proposed" branch for better organization

Moved Tianyu's proposals (thanks for the ideas!) in the README
    to the "proposed" branch. Please git pull the master and proposed
    branches.
The idea is that the master branch will be for finalized, debugged code,
    and the proposed branch will be for proposed changes or works in
    progress. To make a new proposal, branch off of proposals. We can
    then merge back into proposals, and finally back into the master branch.