1.0

The project was rewritten from scratch for 1.0.

Changes:

• Updated CLI interface, some options were removed, please see
  pybind11-stubgen --help for details
• Replaced regex-based signature parsing with more robust procedure
  which enables to produce partially degraded signatures
• Added type parsing/replacing, including deeply annotated types
• Support implicit imports required for static analysis
• Add introspection of pure python functions
• Improved structure of test binary pybind module