Beautiful urls (#18)

* Added uri property to Page model

* Added aliases collection

* Added routing form aliases

* Fixed redirect after page creation

* Added abiltity to support few pages with same title

* Added ability to change uri manually

* Changed hash function

* Changed uri parsing

* Removed pages controller promise

* Modified page's tests

* Added tests for alias model

* Added tests for aliases

* Escaping special characters

* Added missed files

* Fixed bugs related to translation

* Fixed parent page link

* Added server validation for uri

* Changed css properties order

* Made uri property of page be optional

* Prevented alias creation from empty uri

* Moved alias types to model

src/controllers/aliases.js

@@ -0,0 +1,26 @@
+const Alias = require('../models/alias');
+
+/**
+ * @class Aliases
+ * @classdesc Aliases controller
+ */
+class Aliases {
+  /**
+   * @static
+   * Find and return entity with given alias
+   *
+   * @param {string} aliasName - alias name of entity
+   * @returns {Promise<Alias>}
+   */
+  static async get(aliasName) {
+    const alias = await Alias.get(aliasName);
+
+    if (!alias.id) {
+      throw new Error('Entity with given alias does not exist');
+    }
+
+    return alias;
+  }
+}
+
+module.exports = Aliases;