Improve row detection when cells contain floating contents

The row detection mechanism fixes the height of each cell to 100 pixels.
Cells that have floating contents can in some conditions remain taller
than 100 pixels, causing cells in the same row to be of unequal height.
Adding `overflow: hidden` fixes this problem.

jquery.matchHeight.js

@@ -187,7 +187,8 @@
                     'margin-bottom': '0',
                     'border-top-width': '0',
                     'border-bottom-width': '0',
-                    'height': '100px'
+                    'height': '100px',
+                    'overflow': 'hidden'
                 });
             });
 

test.css

@@ -289,4 +289,19 @@ a, a:link, a:visited, a:active, a:hover {
     display: inline-flex;
     vertical-align: top;
     float: none;
+}
+
+/* test with-float */
+
+.with-float .item-0 {
+    float: none;
+    width: auto;
+}
+
+.with-float .item-0 div {
+    display: inline-block;
+    float: left;
+    width: 150px;
+    height: 150px;
+    background: green;
 }

test.html

@@ -344,6 +344,37 @@ <h3>Target</h3>
                     </div>
                 </div>
             </div>
+
+            <div class="items-container with-float">
+                <div class="item item-0">
+                    <div>floated</div>
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                </div>
+                <div class="item item-1">
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                </div>
+                <div class="item item-2">
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                </div>
+                <div class="item item-3">
+                    <p>some text</p>
+                </div>
+                <div class="item item-4">
+                    <p>some text</p>
+                    <p>some text</p>
+                    <p>some text</p>
+                </div>
+            </div>
         </div>
     </body>
 </html>