- optional left-edge dragging.
when disabled (default), the menu can be revealed by dragging any part of the content view
when enabled - menu can only be revealed by dragging from the left edge of the screen. This can be useful if users still want to keep most part of the content view for other gestures.

- use a PaperFold branch that has optional left-edge dragging
[Issue #6] Avoid using `NSBlockOperation addExecutionBlock` which performs the block on separate thread. Replace with a mutable array of copied blocks.
Merge pull request #7 from lxcid/master

Attempts to fix issue #6.
exposed menuTableViewSideShadowView
suppressed warnings in old Xcode projects
reduced shadow alpha
Merge branch 'master' of https://github.com/honcheng/PaperFoldMenuController
Update to 1.0.1 from main repo