Stop using the flag library

[fzerorubigd]

The standard flag library is not a part of Go that everyone love and use. Personally I (and many other) like another flag library.
The problem is, with this library, we should use the standard flag library (LAME IMHO), or else, this won't work.
I think, using the flag library is not required at all, since the parent process, can simply change env for the child library.

And the other problem is, I want to change it to system fork (not execute with os.exec) and in that case I can not use the flag library, since the child is exactly like parent and there is no way to change child Arguments.