Adds support for:
* recept.se (993)
* Strongr Faster (981)
* Pinch of Yum (973)
* Heather Christo (969)
* Fit Slow Cooker Queen (also 969)
* Eat, Live, Run (...also 969)
* The Palatable Life (965)
* ricetteperbimby.it, mundodereceitasbimby.com.pt (962, 968)
Other improvements:
* The `get_yields` method can now handle more units (963)
* Fixups for mob.co.uk website structure (977, 989)
* Adds a new optional retrieval method, `equipment` (982)
* When running a single scraper's tests, a single failure no longer prevents the other tests from running (988)
* Ingredient grouping support added to more scrapers (975)
* A few small nitpicks / typos / cleanups
Thank yous to jacksgreen jknndy Kvan7 strangetom wassupluke :tada: