Update tools.js

Fixed bug in Array.linspace (tools.js).

js/tools.js

@@ -362,7 +362,7 @@ if(!Array.range) {
 if(!Array.linspace) {
     Array.linspace = function(start, end, n){
         var a = [];
-        var step = (end-start)/n;
+        var step = (end-start)/(n-1);
         for(var i=0; i<n; i++){
             a.push(start+step*i);
         }