Revert "Add an extension method to CollectionType"

This reverts commit 3ead6f5.

Author: ikesyo

ReactiveTask/Task.swift

@@ -46,22 +46,17 @@ public struct Task {
 	}
 }
 
-private extension CollectionType where Generator.Element == String {
-	func escaped() -> [String] {
+extension Task: CustomStringConvertible {
+	public var description: String {
 		let whitespaceCharacterSet = NSCharacterSet.whitespaceCharacterSet()
-		return map { string -> String in
-			if string.rangeOfCharacterFromSet(whitespaceCharacterSet) != nil {
-				return "\"\(string)\""
+		let arguments = self.arguments.map { argument -> String in
+			if argument.rangeOfCharacterFromSet(whitespaceCharacterSet) != nil {
+				return "\"\(argument)\""
 			} else {
-				return string
+				return argument
 			}
 		}
-	}
-}
-
-extension Task: CustomStringConvertible {
-	public var description: String {
-		return "\(launchPath) \(arguments.escaped().joinWithSeparator(" "))"
+		return "\(launchPath) \(arguments.joinWithSeparator(" "))"
 	}
 }