Examples: Cleanup equation related in CVX ports.

Originally the equations were all put into an equation array with
an extra leading column for indenting. For newer versions of IPython
the equations are no longer left aligned, so I removed the columns.

I also removed extra newlines around equations, and inserted commas
if appropriate.
Merge pull request #107 from JudsonWilson/judsons_examples

Examples: Cleanup equation related in CVX ports.