XD-1224: Add gradle jacoco test coverage.

- Update gradle to version 1.10
- Enables the jacoco plugin for relevant projects.
- Adds an aggregate 'coverageReport' task at top level to accumulate all
the data for the sub projects.
- Removes the additional jacoco configuration for sonar. Sonar now uses
the coverage data files produced by the gradle plugin.
XD-804 Added integration.support package to dirt and used in AbstractSingleNode...Tests