Add Spec for Tomcat::Manager Module

Add an initial spec to test the Tomcat::Manager module.
Add Tomcat::Manager new Method

Update the Tomcat::Manager module to include a new method.
Add Factory and Spec for Instance

Add a spec for Instance along with a Factory in order to test the
Instance class.
Add Instance Class

Add an Instance class to create an instance of the Tomcat::Manager that
will allow for interaction with a Tomcat Manager service.
Add Travis CI Configuration for Testing

Add a .travis.yml configuration file to allow for integration with the
Travis CI continuous integration testing.
Update README for Usage Information

Update the README file to include usage information.