No support for --option=value

[peterjwest]

A lot of commands use this syntax, not sure how standard it is, but I think supporting it would help prevent confusion.

[c9s]

Not sure if this matches your requirement? https://github.com/c9s/CLIFramework

[NeoVance]

ConsoleKit also supports this syntax. It is fairly common in specific categories of console applications, but it is much more common to see this syntax being used in my experience e.g. --key value