Reduce size of manylinx wheels

Currently our manylinux wheels can be around 100 MB. This will start to be a big problem with PyPI as we have a limit to the amount of storage allotted to our project. Also, this has caused some problems for users trying to use AWS lambda.

We should go ahead and ask for more space on PyPI, but we still need to reduce the size of the wheels otherwise we will eventually keep hitting the limit fairly quickly.