Relates to Issue #2268
Based in the [example XML][1] attachments are listed in the <resources>
node. Since in TiddlyWiki these would be media tiddlers I add then one
by one as separate tiddlers.
There are some things that still need to happen. There should be a mime
type check so we don't attempt to import media tha TiddlyWiki doesn't
support. Also the example suggests the data is base64 encoded so I
blindly use that for the text attribute. Should there be a
`data:mediatyp;base64,…` prefix?
[1]: https://gist.github.com/evernotegists/6116886
4b70257aca