Add custom arrow view.

[wangcash]

No description provided.

[voronianski]

@samvermette +1 for merging

[hemangshah]

@voronianski , its not merged yet by @samvermette . However this update makes really sense !

[hemangshah]

@wangcash great addition! I am using it. +1

Some minor changes will make it available for custom arrow view or default arrow (if some one need it in case)

Create a BOOL property of useCustomArrow;

@property (nonatomic, readwrite) BOOL useCustomArrow;

in drawRect check for this

if(useCustomArrow) {
    return;
}

This property should set to YES, if user wants custom arrow for pull to refresh.

[fnxpt]

+1