Revert "remove class based exercises"

This reverts commit 290e7f1da4.

removeFromArray/removeFromArray.js

@@ -1,13 +1,5 @@
-var removeFromArray = function(array) {
-  elementsToRemove = [...arguments]
-  elementsToRemove.splice(0,1)
-  elementsToRemove.forEach(element => {
-    let index = array.indexOf(element)
-    if (index > -1) {
-      array.splice(index, 1)
-    }
-  })
-  return array
+var removeFromArray = function() {
+
 }
 
 module.exports = removeFromArray