Java Webstart Fixes [#393 responsible:none state:fixed milestone:v2.0]

- Updated to use latest version of the webstart-maven-plugin so that
Permissions and Codebase attributes can be added to manifest. Note
issues with the latest version of the plugin prevents the use of the
pack200
- Updated JNLP properties to add jnlp. prefix to flag them as secure
properties.
- Also updated to use webservices-rt v2.3 and removed an unnecessary
dependency from sola-desktop.