Moto X, G, Razr Mobile detection

Moto RAZR: 
Mozilla/5.0 (Linux; Android 4.0.4; XT910 Build/6.7.2-180_SPU-19-TA-11.6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.135 Mobile Safari/537.36
Moto X:
Mozilla/5.0 (Linux; U; Android 4.2; xx-xx; XT1058 Build/13.9.0Q2.X-70-GHOST-ATT_LE-2) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
Moto G:
Mozilla/5.0 (Linux; Android 4.4.2; XT1033 Build/KXB20.25-1.31) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.136 Mobile Safari/537.36
Merge pull request #79 from hmvs/patch-3

Moto X, G, Razr Mobile detection