Separated parser class nodes and began writing compile methods

app/imports/parser/compileFunctions/sum.js

@@ -0,0 +1,15 @@
+export default function sum(inputNode) {
+  let node = inputNode.roll();
+	if (node.type === 'numberArray'){
+		let total = node.value.reduce((total, num) => total + num, 0);
+		return new ConstantNode({type: 'number', value: total});
+	} else {
+		let errors = node.errors || [];
+		errors.push(`Could not sum ${node.value}`);
+		return new ConstantNode({
+			type: 'uncompiledNode',
+			value: node.value,
+			errors,
+		});
+	}
+}