Added option for pull to refresh from bottom

Author: gabro

README.md

@@ -1,9 +1,10 @@
 # SVPullToRefresh + SVInfiniteScrolling
 
-These UIScrollView categories makes it super easy to add pull-to-refresh and infinite scrolling fonctionalities to any UIScrollView (or any of its subclass). Instead of relying on delegates and/or subclassing `UIViewController`, SVPullToRefresh uses the Objective-C runtime to add the following 2 methods to `UIScrollView`:
+These UIScrollView categories makes it super easy to add pull-to-refresh and infinite scrolling fonctionalities to any UIScrollView (or any of its subclass). Instead of relying on delegates and/or subclassing `UIViewController`, SVPullToRefresh uses the Objective-C runtime to add the following 3 methods to `UIScrollView`:
 
 ```objective-c
 - (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler;
+- (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler position:(SVPullToRefreshPosition)position;
 - (void)addInfiniteScrollingWithActionHandler:(void (^)(void))actionHandler;
 ```
 
@@ -33,6 +34,14 @@ _**Important note if your project doesn't use ARC**: you must add the `-fobjc-ar
     // call [tableView.pullToRefreshView stopAnimating] when done
 }];
 ```
+or if you want pull to refresh from the bottom
+
+```objective-c
+[tableView addPullToRefreshWithActionHandler:^{
+    // prepend data to dataSource, insert cells at top of table view
+    // call [tableView.pullToRefreshView stopAnimating] when done
+} position:SVPullToRefreshPositionBottom];
+```
 
 If you’d like to programmatically trigger the refresh (for instance in `viewDidAppear:`), you can do so with:
 
@@ -112,4 +121,4 @@ SVPullToRefresh is brought to you by [Sam Vermette](http://samvermette.com) and
 
 Big thanks to [@seb_morel](http://twitter.com/seb_morel) for his [Demistifying the Objective-C runtime](http://cocoaheadsmtl.s3.amazonaws.com/demistifying-runtime.pdf) talk which really helped for this project. 
 
-Hat tip to [Loren Brichter](http://twitter.com/lorenb) for inventing pull-to-refresh.
+Hat tip to [Loren Brichter](http://twitter.com/lorenb) for inventing pull-to-refresh.

SVPullToRefresh/UIScrollView+SVPullToRefresh.h

@@ -15,7 +15,15 @@
 
 @interface UIScrollView (SVPullToRefresh)
 
+enum {
+    SVPullToRefreshPositionTop = 0,
+    SVPullToRefreshPositionBottom,
+};
+
+typedef NSUInteger SVPullToRefreshPosition;
+
 - (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler;
+- (void)addPullToRefreshWithActionHandler:(void (^)(void))actionHandler position:(SVPullToRefreshPosition)position;
 - (void)triggerPullToRefresh;
 
 @property (nonatomic, strong, readonly) SVPullToRefreshView *pullToRefreshView;
@@ -42,6 +50,7 @@ typedef NSUInteger SVPullToRefreshState;
 @property (nonatomic, readwrite) UIActivityIndicatorViewStyle activityIndicatorViewStyle;
 
 @property (nonatomic, readonly) SVPullToRefreshState state;
+@property (nonatomic, readonly) SVPullToRefreshPosition position;
 
 - (void)setTitle:(NSString *)title forState:(SVPullToRefreshState)state;
 - (void)setSubtitle:(NSString *)subtitle forState:(SVPullToRefreshState)state;