Update Clover integration documentation

Since Clover is now Open Source, we can no longer acquire licenses for the application. This means that the documentation for integrating Clover with Bamboo needs to be updated.

Please update the Using Bamboo with Clover documentation to specify the new open source workflow.

Example:
Using the "Automatically integrate Clover into this build." in the Miscellaneous tab of the Job configuration is available only for users who purchased Clover licenses before it became open source, as their licenses are still valid for some time.

The other option in the Miscellaneous job config is "Clover is already integrated into this build and a clover.xml file will be produced." With this option selected, please add Clover into your pom.xml for Maven to read (Clover-for-Maven: Basic usage), or build.xml for Ant (Clover-for-Ant: Quickstart guide) – the license portions no longer apply.

For Maven, you can add the following Goals to your command (or Maven task):

clover:setup 
clover:aggregate 
clover:clover

For Ant, you can use the following arguments when calling Ant – and/or in your Ant task:

with.clover
clover.xml