Add Travis, Coverage via Istanbul, and Coveralls.
Add badges to README.md.
Change link from test to production.
Update to latest BitAuth.
Fix BitAuth tests.
Fix BitAuth tests.
Merge pull request #64 from martindale/tests-and-coverage

Add Travis, Coverage via Istanbul, and Coveralls.
Merge pull request #65 from martindale/bitauth

Upgrade to Latest BitAuth
Merge branch 'master' of github.com:bitpay/node-bitpay-client into bug/windows