Issues/pombola/1111 parsing issues speaker and speeches

Fixes #25 and #26, two parsing issues identified by Geoff Kilpin.  More information in the respective tickets and commit messages!

**NOTE**: after fixing #25, we need popit-resolver to do something useful with the name in parenthesis!
The PR https://github.com/mysociety/popit-resolver/pull/2 does add this behaviour, but additionally we need to check that sayit import passes the contents of the parenthesis (e.g. rather than just stripping them).