Log request traces and SSL context creation errors to commons-logging instead of stdout.
Add response content type validation in SimpleServiceRequestBase.
When the response is not XML, a clear message is logged.
Add guide for contributing to project
Rename CONTRIBUTING.md to follow github conventions
Update readme.md

Made some editorial changes to the readme file.
Merge pull request #56 from Lauragra/master

Editorial updates for readme.md file
Merge pull request #52 from vboctor/contrib

Add guide for contributing to project
Merge pull request #40 from eveoh/logging

Use commons-logging instead of printing to stdout
Merge pull request #41 from eveoh/response-content-type-validation

Add response content type validation in SimpleServiceRequestBase