Remove ":" in program_name of log stream name

[SilentEroder]

Problem

Windows contains ":" in program_name of log stream name.
For example, C:\

log stream name should not have ":" and "*". In regex, [^:*]
So, sys.argv[0] causes an error in Windows.

Solution

Remove all ":" in sys.argv[0]

program_name=sys.argv[0],  # before
program_name=sys.argv[0].replace(":", ""),  # after

[kislyuk]

Thanks. As we discussed in #208, Windows is not directly supported by this library. However, this change is sufficiently unobtrusive and has a clear enough purpose (the logger will fail without it) that I'm OK with accepting it.