Accommodate for different archive versions

[kaustubhhiware]

The naming pattern for files and organisation for current archive is radically different as compared to the archive available at the time of writing this code first.

Since facebook now allows you to download data in html OR json format, we'll be using JSON for the following reasons, as suggested by @xprilion as well :

• JSON easier to work with
• JSON more accurate, as html tag search (current approach) might go wrong.
• JSON less susceptible to change.

This issue is more of a guideline, so won't be closed any time soon.