Fixed text field size by finding UIFieldEditor and getting the real cont...

[MsrButterfly]

...ent size. Added margin to all edges. Invoked [self setup] in initWithCoder: to enable Storyboards.

[notDanish]

@MsrButterfly This addresses major issues. thanks for the PR, I hope it is merged by @zoonooz

[filipealva]

Hey @MsrButterfly

How did you find UIFieldEditor?

I'm having a bug related to its bounds on iOS 10, it basically sets itself to a out of screen position. I'm trying to figure out how to find it to manually set its bounds.

[MsrButterfly]

@filipealva These fixes are based on iOS9, I don't know whether it works on iOS10 or not. UIFieldEditor is searched by tranversing all subviews and comparing the classnames.