Tidy/1

Just trying to get main.py and README.md a little bit updated to what seems to be the new syntax.  Not sure what the plan is in terms of the names of solvers, so only made minor changes cvxopt->python.  Let me know if you want me to change README more to reflect, e.g. python, matlab, C?

See following pull request for adding Transpose, which is also needed to make main.py portfolio example work.