Feature/deploy only

Added a deploy-only goal and redeploy-only goal. These are equivalent to deploy and redeploy except that they do not first invoke the execution of the lifecycle phase 'package' prior to executing themselves.

The rationale for this is to handle scenarios where the packaging of the application has already been built and you want to simply just deploy the application without going thru the package process again.  For example, within a CI environment you want to run mvn clean deploy and then as a post-build step you want to just deploy the application. 

This is identical to the goals available in the tomcat7 maven plugin (http://tomcat.apache.org/maven-plugin-2.0/tomcat7-maven-plugin/plugin-info.html)