Updates lexer to allow 'end' instead of '.' if desired

lexer.go

@@ -71,7 +71,9 @@ TokenizationLoop:
 				// in a map of built-ins
 				if isKeyword(wn.val.(string)) {
 					wn.kind = KEYWORD
-				} 
+				} else if wn.val.(string) == "end" {
+					wn = token{END, false, fileLine, f}
+				}
 			}
 			tokens = append(tokens, wn)
 		}

test.fe

@@ -12,7 +12,7 @@ proc fib
 	INT var! s
 
 	proc continue-loop? 
-		fib# 0 > .
+		fib# 0 > end
 
 	continue-loop?
 	while
@@ -20,8 +20,8 @@ proc fib
 		b     set! a
 		s     set! b
 		fib# 1 - set! fib#
-		continue-loop? .
-	a .
+		continue-loop? end
+	a end
 
 # run it!
 sys-args length 0 >
@@ -30,9 +30,9 @@ if
   sys-args 1 list-get INT cast fib println
 else
   "No input\n" stderr file-write
-.
+end
 
-. <-- This dot concludes reading of the file so
+end <-- This dot concludes reading of the file so
       anything below is just comment space that will
 			not be read by the interpreter. Dots always
 			close off a given scope. Since we were in the