Added missing override of initWithFrame:.
Added preserveContentInset property to BMYPullToRefresh.
Updated demo project.
Renamed addPullToRefreshWithHeight: to setPullToRefreshWithHeight:.
Fixed layout issue for scroll views with non-zero left/right contentInset.

Conflicts:
	BMYCircularProgressPullToRefresh/BMYPullToRefreshView/BMYPullToRefreshView.m
Updated README.md.
Minor formatting and code style.
Updated podspec.