Add support for swift language

[PBCivica]

I was run the code analyser on a project that has Objective-c plus swift files and only the Objective-c, xib etc are listed but not the Swift code.

Will be great if we can include this language on the analyser.

[PDegenPortnoy]

@PBCivica Thank you for raising this. Since Ohcount is an open source project, might you be willing to add this functionality?

[Ogglas]

Fixed in #79? @PDegenPortnoy