Add device detection for Lenovo tablet

Lenovo tablet detection is missing. example userAgent: "Mozilla/5.0 (Linux; Android 4.0.3; IdeaTab A2107A-F Build/ IML74K) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Safari/535.19"
Merge pull request #30 from jackpoll/patch-1

Add device detection for Lenovo tablet