Added authorization transation and approved response test
Started adding auth reversal transaction
Added auth reversal class and test case for approval / missing params
Added capture transaction and tests
Merge branch 'feature/auth' into develop
Merge branch 'master' of github.com:petflow/litle

Conflicts:
	src/Petflow/Litle/Transaction/SaleTransaction.php
	tests/UnitTestCase.php
	tests/unit/DuplicateTransactionTest.php