* 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 '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