Custom meta tag to show js smartbanner in newer iOS versions

[patw0929]

Fixed #23.

[coveralls]

Coverage increased (+0.4%) to 85.926% when pulling ddddfee on t23 into 2b628ed on master.

[imdongchen]

Looks good to me.

Just curious, is there a reason people prefer to put the app info (app id, etc.) in the meta tag rather than in js? When I say 'people', I mean those smart banner libraries (including this one) all choose to do this way. I assume there must be a reason for that?

[patw0929]

Hmm... I guess it's a convention to put those information in meta tags. 😛

[imdongchen]

Hey, any plan to merge this pr soon?