open a file in binary mode to save byte codes.

[messi18]

When I try to compile a bs file(helloworld.bs for example) first and run it with command:   java helloworld I get an error: Exception in thread "main" java.lang.ClassFormatError: ....

Just as the issue: https://github.com/headius/bitescript/issues/9

I opened this file, found generated byte array was saved to a file opened not in binary mode. This will cause EOL <-> CRLF conversion on Windows. So I fix it.