Implement PEAR support for UIMA AS

UIMA AS should support the deployment pears. The great advantage of pears is that a user does not have to set up the classpath manually and that the pear can be tested prior deployment with standard uima tooling.
One way to implement it would be to extend the AS deployment descriptor to point to a pear file or pear specifier. In the case it points to a pear file uima as must take care of installing the pear.