remove g3.letv.cn as it seem to be not needed anymore

Previously reported @ #77 
Look like letv don't block it now.
Tested at android phone & PC chrome.
Also it is seriously affecting the speed as it nulls CDN function.
Merge pull request #125 from karlcheong/patch-1

[LETV] remove g3.letv.cn as it seem to be not needed anymore & seriously affecting the speed.