Finish r79

+ Adding V2 endpoints for company metrics
[addresses #68300784] Added customer update method.
[addresses #68596366] Added category proxy model.

Company needs a category model to work with. Will flesh out the category methods in a different story.
[addresses #69119424] Added index call to Categories.
[addresses #68918362] Company and Smart Invite settings.

These models are needed for the company settings pages. Added now to save time later.
[Addresses #69288494] Adding the Enterprises edit page, made changes to the lobbyist v2 model to add a find method
[addresses #69313042] Added company settings update call.

Also changed the smart invite setting to not require the id. It can be found in the API side with just the company id.
Finish r79.1
Bumped version number for Lobbyist-Ruby.
Merge branch 'release/r80'