[BUG] uniform to pass array of vec

[kingfolk]

https://github.com/skeeto/igloojs/blob/master/igloo.js#L225
doesn't work if value is an array of vec.

[skeeto]

You're right, it currently doesn't support all possible uniform types.

[kingfolk]

@skeeto small thing. anyway, wonderful work here. i very enjoy using igloo.