merge fixes

Author: Andrew McKnight

Sources/GitKit/Git.swift

@@ -16,6 +16,7 @@ public final class Git: Shell {
         case cmd(Command, String? = nil)
         case addAll
         case status(short: Bool = false)
+        case clone(url: String , dirName: String? = nil)
         case commit(message: String, allowEmpty: Bool = false, gpgSigned: Bool = false)
         case writeConfig(name: String, value: String)
         case readConfig(name: String)
@@ -159,6 +160,12 @@ public final class Git: Shell {
                 if let revisions = revisions {
                     params.append(revisions)
                 }
+            case .revParse(let abbrevRef, let revision):
+                params = [Command.revParse.rawValue]
+                if abbrevRef {
+                    params.append("--abbrev-ref")
+                }
+                params.append(revision)
             case .lsRemote(url: let url, limitToHeads: let limitToHeads):
                 params = [Command.lsRemote.rawValue]
                 if limitToHeads {