v2.2.0

Changes:

• Rails < 3.2 is not longer supported

Features:

• Added support for <link rel="image_src" href="..."> tag
• Added support for App Links
• Added support for follow meta tag

Bugfixes:

• Fixed double escaping for ampersands (thanks to @srecnig)
• Removed usage of alias_method_chain to fix deprecation warnings with Rails 5
• Fixed the issue when title was truncated in some cases, when site_title was blank
• Fixed meta tag attributes for fb: meta tags