Update version

Fixed a version typo in the readme

Updated TravisCI badge

Changed the robots index, follow columns to null by default

Tagged v2.2.0

Merge branch 'release/v2.2.0-rc2' into 2.2/master

Merge branch '2.2/develop' of github.com:pyrocms/pyrocms into 2.2/master

Merge branch '2.2/master' of github.com:pyrocms/pyrocms into 2.2/master

Merge branch '2.1/develop' into 2.2/develop

Conflicts:
	system/cms/core/REST_Controller.php
	system/cms/libraries/Streams/drivers/Streams_entries.php
	system/cms/modules/pages/controllers/pages.php
	system/cms/modules/streams_core/models/row_m.php
	system/cms/modules/users/views/admin/form.php

Updated release date