* Updated Mozilla user-agent string
* IoUtils.writeFile() - more careful about closing InputStream and
OutputStream after an exception
* HttpUtils - Handling of "-1" HTTP Response code; this happens on older
Android devices
* Improvements to JsonUtils and XmlUtils (NULL handling, XML special
character encoding, etc)
* XmlUtils.toString() and JsonUtils.toString() now both take a second
argument, `boolean indent`
* Removed TransformerFactory (backported) implementation of generating
XML as it is no longer used