Revert "remove old markdown engine work-in-progress"

This reverts commit ee470b5317.

test/javascripts/lib/pretty-text-test.js.es6

@@ -42,6 +42,9 @@ QUnit.assert.cookedPara = function(input, expected, message) {
 };
 
 QUnit.test("buildOptions", assert => {
+  assert.ok(buildOptions({ siteSettings: { allow_html_tables: true } }).features.table, 'tables enabled');
+  assert.ok(!buildOptions({ siteSettings: { allow_html_tables: false } }).features.table, 'tables disabled');
+
   assert.ok(buildOptions({ siteSettings: { enable_emoji: true } }).features.emoji, 'emoji enabled');
   assert.ok(!buildOptions({ siteSettings: { enable_emoji: false } }).features.emoji, 'emoji disabled');
 });

test/javascripts/models/model-test.js.es6

@@ -18,4 +18,4 @@ QUnit.test("extractByKey: converts a list of hashes into a hash of instances of
 QUnit.test("extractByKey: returns an empty hash if there isn't anything to convert", assert => {
   assert.deepEqual(Model.extractByKey(), {}, "when called without parameters");
   assert.deepEqual(Model.extractByKey([]), {}, "when called with an empty array");
-});
+});