[TASK] update ripple-lib to 0.9.0-rc5
[TEST] un-skip tests that were invalid secret related

this was fixed by reducing the secret approximation loop logic in ripple-lib
[DOC] remove contributors doc

github shows this information already
[FIX] assume when destination amount issuer is not specified that the user means to use the destination account as the issuer
[TEST] update test cases
[TEST] remove console log
[TEST] update test to use skip method instead of xit
[TEST] update equal to strictEqual
[TEST] remove old duplicate test case