Exit status for "ccjs" command

[bitc]

When running ccjs from the command line, it will return exit status "0" (Success) even when there were errors.

It should return some other exit status to indicate an error

$ ccjs test.js && echo "SUCCESS"

... snip ...

_build/all.js:2214: ERROR - Parse error. identifier is a reserved word
      while (k < final) {
                 ^

11 error(s), 0 warning(s)
SUCCESS