CB-5346 Fix and cleanup broken Android unit test

- Found stale cordova.js in the test project. Changed ant script to copy in
  a fresh one in the pre-build stage. Removed stale copies from git, added
  to .gitignore. This is what was causing the test failure when sending
  javascript to the webview.
- Found almost-stale copy of device plugin, did the same as above.
- Fixed spacing in log messages in CordovaWebView.
- Updated README.md with current information.
- Removed dollar signs that were previously accidently appended to the license.
- Added cordova version to html pages, next to the other metadata.
- Fix incorrect separator in the viewport meta tag.
- Changed old-style <log> tag to <preference name="loglevel"> in config.xml.
- In BackButtonMultiPageTest, increased the TIMEOUT so the deviceready event
  can trigger the referenced javascript, improved the setup() method to
  explicitly load the starting point.

test/assets/www/htmlnotfound/error.html

@@ -1,19 +1,19 @@
 <!--
-         Licensed to the Apache Software Foundation (ASF) under one$
-         or more contributor license agreements.  See the NOTICE file$
-         distributed with this work for additional information$
-         regarding copyright ownership.  The ASF licenses this file$
-         to you 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$
+         Licensed to the Apache Software Foundation (ASF) under one
+         or more contributor license agreements.  See the NOTICE file
+         distributed with this work for additional information
+         regarding copyright ownership.  The ASF licenses this file
+         to you 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.$
 -->
 This is an error page.