Began work on rewriting parser without object orientation

Parsing is expensive, if the parse tree can be stored on the DB it can 
save a lot of compute time, but mongo can't store Classes, so we 
re-write without classes

app/imports/api/engine/computation/utility/collate.js

@@ -0,0 +1,12 @@
+// Collate the array with the given value or array of values, creating the
+// array if it doesn't exist
+export default function collate(array, toAdd){
+  if (Array.isArray(toAdd) && toAdd.length){
+    if (!array) array = [];
+    array.push(...toAdd);
+  } else if (toAdd) {
+    if (!array) array = [];
+    array.push(toAdd);
+  }
+  return array;
+}