Download Text : feature request

[gwpl]

Could you please download also and store posts text?

(If post includes some pictures it would be nice if they would be reffered somehow, e.g. filename included inside text)

[gwpl]

I propose to add this for now , so people trying to preserve tumblr blogs will preserve also text/captions in xml/json files, for which we can introduce later conversion to html files:
#109