Review install_requires

[jmsfltchr]

Description

Remove the need for an install_requires.txt file. install_requires.txt is used to fill the install_requires field for PyPi. We need this because the assemble-pip target doesn't support the flags that we need in the requirements.txt file. It throws an error if we try. Reading up on it and it seems commonly accepted that the dependencies in requirements.txt and install_requires will differ, and therefore we should my expected solution is to provide a separate list of requirements manually to assemble-pip.