v4.0.0

Breaking changes from 3.5.6:

• The following now return boolean instead of int:
  • HelloSignClient.cancelSignatureRequest()
  • HelloSignClient.destroyTeam()
• Update DEFAULT_OAUTH_TOKEN_URL to app.*
• Removed deprecated methods:
  • Removed methods for getOauthData that don't include a state parameter
  • Removed HelloSignClient(String email, String password)
  • Removed createAccount(String email, String password)
  • Removed createAccount(String email, String password, String clientId, String clientSecret)

Non-breaking changes:

• Refactored HTTP client code to be testable.
• Rebuilt JUnit tests to run off Mockito using pre-generated responses.
• Added travis-ci config to run tests against all changes.
• Reformatted entire code base.
• Make HttpClient injectable through the protected constructor, update tests
• Don't swallow exception in isAccountValid()
• General bug fixes and adding missing enum values for OAuth Scopes

This closes issue #13 .