Added merge_json_files function
pep8-ifying (pep8ify, manual)
TYPO: iter_uris filter
Updated merge_json_files to accept existing data and keep _meta
Replaced iter_uris with a bs4 implementation
Updated redem_summary.jinja2: fixing unclosed <a> tags, formatting
Added target=_blank for <a> tags starting with http
Updated base.jinja2: loading datatable tablesorter on_click(th)
Removing navbar-fixed-top and bootstrap scroll indicators (because they break #anchors)
Updated iter_uris = iter_uris_bs4, added test
Updated canonicalize_uri and process_urls (TODO: refactor)