Remove unneeded CGContext Save and Restore calls.

In the private class methods of JSQMessagesAvatarImageFactory
(jsq_imageWitInitials, jsq_circularImage) there were calls to save and restore
the state of the graphic context.

The calls are not needed because UIGraphicsBeginImageContext creates a new
context in a default state.

Author: tobiasoleary

JSQMessagesViewController/Factories/JSQMessagesAvatarImageFactory.m

@@ -130,15 +130,13 @@ + (UIImage *)jsq_imageWitInitials:(NSString *)initials
     UIGraphicsBeginImageContextWithOptions(frame.size, NO, [UIScreen mainScreen].scale);
     {
         CGContextRef context = UIGraphicsGetCurrentContext();
-        CGContextSaveGState(context);
 
         CGContextSetFillColorWithColor(context, backgroundColor.CGColor);
         CGContextFillRect(context, frame);
         [initials drawAtPoint:drawPoint withAttributes:attributes];
 
         image = UIGraphicsGetImageFromCurrentImageContext();
 
-        CGContextRestoreGState(context);
     }
     UIGraphicsEndImageContext();
 
@@ -156,7 +154,6 @@ + (UIImage *)jsq_circularImage:(UIImage *)image withDiameter:(NSUInteger)diamete
     UIGraphicsBeginImageContextWithOptions(frame.size, NO, [UIScreen mainScreen].scale);
     {
         CGContextRef context = UIGraphicsGetCurrentContext();
-        CGContextSaveGState(context);
 
         UIBezierPath *imgPath = [UIBezierPath bezierPathWithOvalInRect:frame];
         [imgPath addClip];
@@ -168,8 +165,7 @@ + (UIImage *)jsq_circularImage:(UIImage *)image withDiameter:(NSUInteger)diamete
         }
 
         newImage = UIGraphicsGetImageFromCurrentImageContext();
-
-        CGContextRestoreGState(context);
+        
     }
     UIGraphicsEndImageContext();