Feature/transactions

[bashleigh]

Feel like I've introduced more issues than completed here. The goal of this PR was to implement the basic required sale, refund and find methods with types.

Newly created, related issues

• Feel like the types I've added should be moved to definitelyTyped Move types to definitelyTyped  #19
• There should be some in depth documentation on how to use the transactions and subscription methods from start to finish including token/nonce creation Create in depth description on transactions and subscriptions #18
• Subscription methods should be added, tested etc in a separate PR as this one is a little large Add subscription creation methods to braintreeProvider #20

Relating issues

• Add transaction methods Add methods to braintree.provider for creating transactions #4
• Add transaction types Add sale types for using the sale and refund methods  #9
• Add tests for transactions Add tests for transactions #6
• Add refund method Add refund method #13 Add methods for refunds etc #7 (7 is duplicate)

I also added my Braintree credentials to travis. Feel like maybe I should mock the responses instead of making a call the braintree. It's likely that PR's from outside of this repo will fail because travis is making the call the braintree without the creds on the contributor's repo and not this one.

[shekohex]

this needs to be formatted, i think !

[bashleigh]

no I've ran format on it. What's the problem? The decorator?

[bashleigh]

ah think I see now!

[coveralls]

Pull Request Test Coverage Report for Build 85

• 5 of 10 (50.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.3%) to 88.462%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/braintree.provider.ts	3	8	37.5%

Totals
Change from base Build 72:	-2.3%
Covered Lines:	140
Relevant Lines:	149

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💛 - Coveralls