Fixed bug (#165) that caused that html template caching did not work properly.
Merge pull request #163 from svenkubiak/develop

updated documentation for sending mails
preparation for 3.1.4
[maven-release-plugin] prepare release ninja-3.1.4
[maven-release-plugin] prepare for next development iteration
Fixed type and generation of javadoc.
fixed flaky testcase.
Logback is now only configured when on classpath. 
Allows to use jul logging on App Engine.
Support getInjector() on FluentLenium testcases
"username" of SecureFilter now static final and can be referenced 
              from other modules in a typesafe way.
Fixed imports and added test to make sure
USERNAME in SecureFilter is "username".
tiny thing - updated 2013 to 2014 in footer of demo app.
changed Result.NO_HTTP_CONTENT to Result.NO_HTTP_BODY in changelog.md