- Added build_clib command to download and build unqlite
- Added clean command to remove download directory for build_clib and SWIG generated files
- Added setup.cfg to specify build options (including defaults)
- Added custom 'install_lib' step as a workaround for python bug #5243
- Refactored setup.py to separate out each build command as a separate class
- Updated README.md to include new build options available