Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/ret/lib/positions.js

@@ -0,0 +1,17 @@
+var types = require('./types');
+
+exports.wordBoundary = function() {
+  return { type: types.POSITION, value: 'b' };
+};
+
+exports.nonWordBoundary = function() {
+  return { type: types.POSITION, value: 'B' };
+};
+
+exports.begin = function() {
+  return { type: types.POSITION, value: '^' };
+};
+
+exports.end = function() {
+  return { type: types.POSITION, value: '$' };
+};