Improved Javadocs and error reporting.
Using write() instead of print().
Removed usages of sendError() since this is not compatible with
async I/O, and just setting the response code instead.
Updated echo demo to use Dojo's require() and the remoteCall()
functionality.
Updated Jetty to 9.2.6 and Dojo to 1.10.3.
Specified explicitly to delay the dispatch until content, to avoid
blocking waits between the headers and the content.
Improved logging, adding a timestamp for each log line.
Avoid to send /meta/connect messages between the call to reload() and
the destruction of the JavaScript context.
Added echo demo for jQuery.