Features
* basic exceptions ([2c4f96d](https://github.com/wooddance/parselx/commit/2c4f96d))
* basic Selector class ([11aacf2](https://github.com/wooddance/parselx/commit/11aacf2))
* parser and partial function ([14195f9](https://github.com/wooddance/parselx/commit/14195f9))
* process by complex rules ([521dd2a](https://github.com/wooddance/parselx/commit/521dd2a))
* X class implementation ([c3ecd25](https://github.com/wooddance/parselx/commit/c3ecd25))