- Added ant target updatePackageXmlManaged for generating a package xml
  for the managed package which may have extra attributes.
- Pass installClass and uninstallClass scripts in package xml generation
  for managed package deployments to the packaging org
- Modify deployCIPackageOrg to call updatePackageXmlManaged before
  deployment to dynamically build the managed version of the package.xml
- Removed runAllTests from deployManagedUAT as it can be called after
  deployment via the runAllTests target
Add support for postInstallClass and uninstallClass elements