Bug Fix - #369 task config color.alternate does not take multiple args

- Fixed bug that meant these commands would not work:
    $ task config name 'one two three'
    $ task config name one two three
  (thanks to Richard Querin).

src/command.cpp

@@ -560,7 +560,15 @@ int handleConfig (std::string &outs)
       std::string value = "";
 
       if (args.size () > 1)
-        value = args[1];
+      {
+        for (unsigned int i = 1; i < args.size (); ++i)
+        {
+          if (i > 1)
+            value += " ";
+
+          value += args[i];
+        }
+      }
 
       if (name != "")
       {