###MovableView

Sometime you need to move a view simply, for example, when keybord covered it's textfield, you need to move the content view, that's what MovableView is.

Configuration:

    self.contentView.direction = MovableViewDirectionUp;
	self.contentView.distance = 85.;

Move Up:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
   [self.contentView moveBackward:NO];
   return YES;
}

Move Down:

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
	[self.contentView moveBackward:YES];
    return YES;
}