Merge pull request #12 from WangHengHeng/master

Fix #13,  Square checkbox of size less than 20 x 20 px appears distorted.

Author: Boris-Em

Classes/BEMPathManager.m

@@ -17,7 +17,7 @@ - (UIBezierPath *)pathForBox {
     switch (self.boxType) {
         case BEMBoxTypeSquare:
             path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, self.size, self.size) cornerRadius:3.0];
-            [path applyTransform:CGAffineTransformRotate(CGAffineTransformIdentity, M_PI / 2)];
+            [path applyTransform:CGAffineTransformRotate(CGAffineTransformIdentity, M_PI * 2.5)];
             [path applyTransform:CGAffineTransformMakeTranslation(self.size, 0)];
             break;