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/parser/parseTree/_index.js

@@ -0,0 +1,5 @@
+import accessor from './accessor.js';
+
+export default Object.freeze({
+  accessor,
+});