Add Bill URL for Divisions and Speeches

Bill subdebates include a unique ID that is used by ParlInfo to
tie speeches, the bill text and the bill digest together on a single
page which has a permanent URL. This patch adds this URL as an
attribute to speech major headings (which contain the Bill name used
for Public Whip) and divisions.
Change `strip()` to `strip` - remove empty parameters on strip method call (more Rubyesque).