Add classes for Payouts, Payout Instructions, and Payout Instruction Transactions.
Added methods to GET tokens, GET payouts, GET payout/:id, DELETE payout/:id
Tweaked request interface to contain DELETE method constant.
Added tests for most functions, more to follow
Some tweaks, added tests to remaining Payout, PayoutInstruction and PayoutTransaction classes.
Began adding tests for Client functions
Check for errors returned in GetPayouts
Fix issues reported by phpcs
Rename some variables
Add comments based on Payroll API doc
Add licences, comments, and fix phpcs issues
Add tests for Client functions
Merge pull request #96 from afk11/payouts

Looks good, thank you