Batcave

- Added
- Added support for extracting build artifacts from container builds.

- Changed
- Use property decorator.
- Fix bad use of self.
- Don't install cx_Freeze if Python > 3.6.
- Upgraded psutil to 5.5.1.
- Upgraded pyodbc to 4.0.26.

- Removed
- Removed virtualenv.

- Added
- Added support for nested configurations.
- Added build.ConfigurationBuilder() argument ignore_configs.
- Added start and stop methods to iispy.IISInstance.
- Added ignore_files and no_expand_files to build.ConfigurationBuilder and expander.Expander.expand_directory().
- Added prdb.Product.children property.

- Changed
- Server().get_iis_instance() should return local reference.
- Made all names more Pythonic.
- Made module constants into class member variables where possible.
- Fixed usage of configure and make in GNUBuilder.
- Upgraded psutil to 5.5.0.
- Upgraded pyQt to 5.12.
- Upgraded setuptools to 40.8.0.

- Added
- Added qbpy.QuickBuildCfg.remove() method.

- Changed
- Fix git errors on push not throwing catch-able exceptions.
- Updated PRDB schema to use good python naming convention.
- Make sure iispy module does not cause an import failure on Linux.
- Provide proper iteration on groups, classes, and properties in prdb module.
- Provide interface for adding a property class.
- Upgraded docker to 3.7.0.
- Upgraded p4python to 2018.2.1743033.
- Upgraded pyodbc to 4.0.25.
- Upgraded unittest-xml-reporting to 2.2.1.

- Changed
- Fix expander.Expander.evaluate_expression().

- Changed
- Fix build.EUPBuilder commander.Commander variable handling.

- Changed
- Revert inadvertent PRDB schema change.