Nixpkgs-pytools

Added
- adding support for python 2.7

Added
- adding python-rewrite-imports

Added
- support for directly adding package to `nixpkgs` via `--nixpkgs-root`
- `--stdout` option to print derivation instead of writing to file
- more complete unit tests
- detect `pytest` and `nose` as `checkInputs` and automatically set `checkPhase`
- automatic `http://` -> `https://` urls if they exist
- `fetchPypi` now includes the `extension` if not `tar.gz`

Changed
- removed dependency on `nix-prefetch-url`
- mocking `setup(...)` is now the default

Added
- adds a changelog

Changed
- add unit tests via pytest

Added
- setup.py support
- package is released to pypi, automatic publishing of the package to pypi via travis

Changed
- move files to subfolder for setup.py packaging support

Removed
- remove support for direct calling of `python-package-init.py`, install the
package and run `python-package-init` instead