Merge pull request #14 from dnpp73/master

ISScalingActivityIndicatorView の [super stopAnimating] にて EXC_BAD_ACCESS が発生する
 * ISRefreshControl.m
   * change wself type to __block.
   * fix to use wself in completion block.

 * .gitignore
   * add xcuserdata, .DS_Store to .gitignore.
 * Podfile
   * remove ISMethodSwizzling from Podfile because already included.
     * ishkawa/ISRefreshControl@689048391db1ff3c9f9d046f3c15429ff5e7a655
Merge branch 'master' into develop
removed ISRefreshControl/ISMethodSwizzling.* (use Pods/) #15
Merge branch 'fix_self_refs' of github.com:hirakiuc/ISRefreshControl into merge/15
Merge branch 'develop' into merge/15
added ISMethodSwizzling in Podfile.
not use weak reference because UIView.animateWithDuration is a class method.
Merge branch 'merge/15' into develop
replaced QuartzCore APIs with CoreGraphics APIs.
improved animation of ISScalingActivityIndicaotrView.
refactored loading ISRefreshControl from xib/storyboard.
updated podspec
Merge branch 'develop'
udpated README
updated instructions for installing without CocoaPods. #16
added CHANGELOG. #17
Merge branch 'master' of github.com:ishkawa/ISRefreshControl
updated Kiwi
use UIBezierPath instead of CGMutablePath