Bumped version number for checklists_scrapers package.
Updated templates to include slugs for entry tags as class names.

This makes it easy to still the template for for example, entries
with a tag of 'rare' have the species names rendered in a different
colour.
Removed title on mailing list page.

Changed 'Subscribe' in the main menu to 'Newsletters' and 'News' to
'Latest News' so all the main items are nouns (destinations) rather than
the previous mix of nouns and actions. That allowed the title and very short
desciption from the mailing lists to be removed (matching the latest news
page which also does not have a title). So now the highlighted items in the
main menu act as titles for the respective pages.
Updated styling of site pages.

Split the menu into two levels: a main menu containing the news, newsletters
and language chooser and a sub-level which contains the page specific options.
For the news page the sub-menu contains the search button. For the
newsletters page the sub-menu is currently empty and so not shown.

Improved the basic styling over the default Bootstrap 3 look: Cleaner, brighter
page header with the site title changed to "Birding <x>" where <x> refers to the
geographical area covered (replacing the default site title which was the
project name, Honeyguide. Added a page foot which can be used to link to
additional pages.