Merge pull request #5 from whatcher2/master

Fix divide by 0 condition when layoutSubviews runs before scrollView_ has bounds and contentSize
Add `initWithCoder:` for initializing WKVerticalScrollBar from Interface Builder; Factor initialization into `commonInit`
Add podspec to enable installation via Cocoapods by overriding the :git options
Remove the v0.3.2 tag as its causing Cocoapods to complain
Refesh on rotations when contentHeight == frameHeight
Merge pull request #7 from whatcher2/artifactOnRotation

Refesh on rotations when contentHeight == frameHeight
Merge pull request #6 from GateGuru/feature/add-initwithcoder-initialization

Add initWithCoder: initialization code path
Fixes showing bar and empty accessory handle when scrolling is unavailable
Merge branch 'DoNotShowWhenContentLessThanFrame' of https://github.com/whatcher2/WKVerticalScrollBar into whatcher2-DoNotShowWhenContentLessThanFrame