fieldMargin 300 -> 1000

+ リファクタ

Add Bright Mode to Transparent Type of Background

fix

customizable

update README

change brightView offset y

add "durationOfPreventingTapBackgroundArea"

change deployment target

update README

Merge pull request takuoka#4 from JFBEST/Swift2.1

Tiny additional modification for Swift 2.1 / Xcode 7.1