some comments and Readme changes

stdlib/stdlib.lsp

@@ -42,19 +42,10 @@
     (second (system-cmd (+ "echo ${" var "} | tr -d \"\n\""))))
 
 
-; return second element of list
 (defun second (l) (index l 1))
-
-; return third element of list
 (defun third (l) (index l 2))
-
-; return fourth element of list
 (defun fourth (l) (index l 3))
-
-; return fifth element of list
 (defun fifth (l) (index l 4))
-
-; return nth element of list, indexing from 0
 (defun nth (i l) (index l i))
 
 ; return 1 when list contains item otherwise 0