now using 'iShawnWang'

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Results 2 issues of now using 'iShawnWang'

Add IBInspectable and IB_DESIGNABLE

So that we can edit and live preview GCPlaceholderTextView Property in the storyboard :) ![storyboardproperty](https://cloud.githubusercontent.com/assets/12770259/13903616/fcfc97e4-eebd-11e5-96bb-e0a177b3880a.png)

add storyboard support and sample storyboard

支持在 storyboard 中 拖线 设置 WXTabbarController 的 viewcontrollers