Bump version to 1.2.1

Put docs dependencies in a requirements file

Bump version

Bump version and annotate some bases

Release 0.1.1

multivectors.py:
* Small fix in module docstring
+ Blade.__(eq|ne|[lg][te])__
  * __eq__ and __ne__ defined for all objects
  * __[lg][te]__ defined only for scalar blades
* Small fix in Blade.__rpow__ docstring: cannot use isclose on Blade
+ MultiVector.__(eq|ne)__
- doctest.testmod is done elsewhere

README.md:
* Follow module docstring

+docs.md:
* More formal documentation, mostly of geometric algebra
* Contains code too, which is doctested

+run_tests.py:
* Exits with a 1 status if doctesting the module or any MD has failures
* Used for workflow

Bump version

Bump to version 0.0.0