use default search title from speeches app
link in green instance header to edit instance details
remove almost all of the user dropdown menu
Add missing things to requirements.txt.
Document roles of get_transcripts and parse_transcript.
Add a couple of methods to make it easier to set options in subclasses.
Make sure the data directory in scrapers is created.

Adding a file to this directory will make sure is there - using
.gitignore seems harmless.
Shift most of scrapers/utils.py to SayIt
Change existing scrapers to use helper classes from SayIt.

I've checked that these all function, except for the Charles Taylor
one - www.sc-sl.org is currently down.

For now, let's leave out the philadelphia scraper, which is going to disappear
from sayit.mysociety.org altogether.