* Add -O flag to ragg2 as an alias for -o a.out or -o <file> (without extension)
* Add rabin2 -M (get main) for Java Class files
* Add emit_trace (code tracer) for r_egg. useful to debug
- ragg2 -a trace hello.r
- Add emit->jmp() function pointer and emit->retvar
- many fixes in function calls and definitions
- Added support for 'break;' 'break();' and 'goto();'
- Added .ret variable as an alias for eax, rax or r0
