FELIX-1988 Apply 5.main_template.patch by Valentin Valchev (thanks) with the following changes: (1) also externalize the footer as a template (for consistency), (2) create a readTemplateFile method to read the file, (3) return an empty string (instead of using null) of the file fails to be read

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@910864 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/webconsole/src/main/resources/templates/main_footer.html b/webconsole/src/main/resources/templates/main_footer.html
new file mode 100644
index 0000000..afb7967
--- /dev/null
+++ b/webconsole/src/main/resources/templates/main_footer.html
@@ -0,0 +1,3 @@
+    </div>
+  </body>
+</html>
\ No newline at end of file