Process Dashboard Refactor

The current process dashboard[1] is based on the former dashbuilder tech. This has several implications:

1.- It relies on an external webapp, which makes the packaging and deployment of the workbench a bit more complex.
2.- It makes difficult to go back & forth from the dashboard to the jBPM screens, i.e: task lists & process instances.
3.- It's not aligned with the Workbench tech stack (GWT/UF)

Our aim is to redo from scratch the process dashboard with the following goals in mind:

1.- Align the tech with the Workbench platform.
2.- Enable the integration of the dashboard with other jBPM screens.
3.- Leverage the GWT/UF/Bootstrap stack to provide a much better dashboard.

[1] http://docs.jboss.org/jbpm/v6.2/userguide/chap-bam.html#sect-bam-processdashboard