Remove a superfluous "s" in AnnotationsLayerBuilder from files in web/

This patch makes the naming consistent with the `TextLayerBuilder`, and also the new `AnnotationLayer`, and should thus help reduce possible confusion when working with the code.
Please note that the files were renamed using `git mv`, in order to preserve blame.

web/annotation_layer_builder.css

@@ -0,0 +1,68 @@
+/* Copyright 2014 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+.annotationLayer section {
+  position: absolute;
+}
+
+.annotationLayer .annotLink > a:hover {
+  opacity: 0.2;
+  background: #ff0;
+  box-shadow: 0px 2px 10px #ff0;
+}
+
+.annotationLayer .annotText > img {
+  position: absolute;
+  cursor: pointer;
+}
+
+.annotationLayer .annotTextContentWrapper {
+  position: absolute;
+  width: 20em;
+}
+
+.annotationLayer .annotTextContent {
+  z-index: 200;
+  float: left;
+  max-width: 20em;
+  background-color: #FFFF99;
+  box-shadow: 0px 2px 5px #333;
+  border-radius: 2px;
+  padding: 0.6em;
+  cursor: pointer;
+}
+
+.annotationLayer .annotTextContent > h1 {
+  font-size: 1em;
+  border-bottom: 1px solid #000000;
+  padding-bottom: 0.2em;
+}
+
+.annotationLayer .annotTextContent > p {
+  padding-top: 0.2em;
+}
+
+.annotationLayer .annotLink > a {
+  position: absolute;
+  font-size: 1em;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+}
+
+.annotationLayer .annotLink > a /* -ms-a */  {
+  background: url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7") 0 0 repeat;
+}