fix frameborder for ie8

we need added frame border attribute before added iframe in DOM

with modified integration: http://curebit.github.io/curebit/custom-integration.html
with default: http://curebit.github.io/curebit/default-integration.html

modified: http://monosnap.com/image/YLbe8V0k25psdripes8hYwc0LzWcOV.png
default: http://monosnap.com/image/L5EczVwy3NTKDaVpZPv17ag50Qb9vx.png