Added license notice to all C++ files
Formatting and commend cleanup in .cpp files
Added more comments
Added missing <cassert> header to get.cpp
Commented start mengine.sh scripts and gave more explicit instructions for OS X
Add OS X binary
will work on OS X 10.6 64-bit or later
Revert "Added license notice to all C++ files"

This reverts commit 0c809d178dd4809d9abdaf9e1dd492710d5fb062.