Add color to rebar console output

With the addition of so many extraenous "entering/leaving directory" messages
I couldn't make sense of what rebar was doing anymore.  Color makes at-a-glance
deciphering of dir changes vs. git actions vs. compiles much easier.

We can probably add color to a dozen more places, but I haven't hit those
edge cases yet.
Add additional CONSOLE_GREEN for Compile success