Readme: update to version 0.2.0.

Append '.git' to SwiftShell dependency.

In order to hopefully solve a weird problem involving Swift Package Manager, Marathon, adding both FileSmith and SwiftShell to Marathon, and possibly Swift package manager not understanding that https://github.com/kareman/SwiftShell.git and https://github.com/kareman/SwiftShell is the same package.

Add exhaustive 'catch' clause for Linux.

Got this error:

/home/name/FileSmith/Sources/Directory.swift:338:4: error: errors thrown from here are not handled because the enclosing catch is not exhaustive
                        try FileManager().createDirectory(atPath: tempdirectory, withIntermediateDirectories: true, attributes: nil)
                        ^
/home/name/FileSmith/Sources/Directory.swift:339:11: error: errors thrown from here are not handled because the enclosing catch is not exhaustive
                        return try Directory(open: tempdirectory)

Create DirectoryPath.root in a platform independent way.

Set iOS target to 9.0. Update podspec with SwiftShell dependency.

Travis: update CocoaPods before testing pod spec.

Add copy(toDirectory:) to Directory and File.