add ie7 inline block mixin and add ability to center pagination

lib/mixins.less

@@ -25,6 +25,12 @@
   margin-right: auto;
 }
 
+// IE7 inline-block
+.ie7-inline-block() {
+  *display: inline; /* IE7 inline-block hack */
+  *zoom: 1;
+}
+
 // Sizing shortcuts
 .size(@height: 5px, @width: 5px) {
   width: @width;

lib/pagination.less

@@ -5,7 +5,8 @@
   height: @baseLineHeight * 2;
   margin: @baseLineHeight 0;
   ul {
-    float: left;
+    display: inline-block;
+    .ie7-inline-block();
     margin: 0;
     border: 1px solid #ddd;
     border: 1px solid rgba(0,0,0,.15);
@@ -37,4 +38,9 @@
   .next a {
     border: 0;
   }
+
+  // Centered
+  &.centered {
+    text-align: center;
+  }
 }