Tools for Misfigured Urls

[greebie]

There is an unresolved issue when parsing for urls that bleed into regular text (often because of rich text features like tables etc.).

For example,

https://www.example.com/index.html.Beginning_of_following_paragraph which could be resolved by accepting only one period after the url, except that

https://www.example.com/index.htmlBeginning_of_following_paragraph would still not be resolved.

I think an easier solution might be to offer some optional cleaning functions for the dataframes that archivr produces, but there could be other ideas.

[greebie]

Given discussion in #28, we should include operations for reading xml and html as well.

[adam3smith]

I'll work on html and xml parsing