Tldr-py

- support the new syntax, 22

- support search commands in other platforms, 20

- support locate the command page, 11

- support custom the configuration file via `TLDR_CONFIG_DIR`, 9

- support rebuild the index(8), and rebuild the index after updating
- improve tests, 12

- python3.x support
- add tests and code coverage
- return parsed lines instead of print them directly
- improve error output when detect unsupported color