Loosen PIP requirements (nutonomy#136)

* Make requirements less strict

* Added clarification on file name, minor corrections

preparation for pip package v1.0.0 (nutonomy#96)

Added disclaimer (nutonomy#58)

* Added disclaimer
* Added actual warning in the code

setup.py for PIP packages (nutonomy#27)

* Added setup.py for pip installation

* Updated version