Refactor SoapClient and its unit tests.

Allow passing request options to Guzzle client.

Merge pull request #3 from meng-tian/scrutinizer-config

Add scrutinizer config.

Add assertions for RequestException, should carry on normal response …

…interpretation.

Update README.md

Improve test suites

- split unit tests and functional tests
- add unit tests for SoapClient and Factory
- add more web services in functional test but exclude it from test
  coverage
- support non-wsdl mode