[phobos] I wrote NamedMutex for IPC

[SHOO]

Me challenge at this time is NamedMutex.

http://ideone.com/EKYBO

The module about IPC is not included in Phobos and druntime at all now.
I suggest NamedMutex by this contribution experimentally.
NamedMutex can operate like normal Mutex. But NamedMutex allows
reference by name over the process.
This may help that file locking in CGI, restraint of the multi-running
process, etc...

What do you think?

P.S.
I can say with confidence this time. "I do not see Tango at all."