Update requirements_dev.txt to improve contributor workflow

[juliusgeo]

This change makes it so that you can get from cloning the repo to running the tests in only 3 commands:

pip install -r requirements_dev.txt 
python setup.py develop --tiledb=<tile-db path>
python -m pytest tiledb

The version numbers that I put in are just the latest version, as I am not sure what the correct minimum version is.