Get Single Record

[benphelps]

This change adds support for fetching a single record, via methods inherited from Harvesting::Models::Base

Used as such:

harvest = Harvesting::Client.new(access_token: access_token, account_id: account_id)
client = Harvesting::Models::Client.get(7327524, client: harvest)

This is the interface suggest in #5.

[etagwerker]

@benphelps This is a great start!

A few things are missing:

• Could you add documentation to the new public method? If you use https://yardoc.org/ then it will get regenerated here: https://www.rubydoc.info/github/ombulabs/harvesting/Harvesting/Models/Base
• Could you add a spec for the new method? Just make sure you don't commit and push secret credentials in the VCR cassettes.
• Could you add a new example to README.md so that other devs can see how to use it?

[lubc]

Hey @benphelps, did you have a chance to look at @etagwerker 's comment? Thanks!

[mscottford]

@lubc I created #22 to try and address the code review comments so that we can get this one merged.

[lthurston]

I've created #23, which includes everything from #22 plus gets invoices model working for GET and includes the line items.

Thanks everyone for your efforts on this! @lubc or @etagwerker, do you have a sense as to when you can get this merged in?