Remove numpy and numba from pip requirements

These are installed separately due to build issues. Having them
here was redundant, and a cause of potential confusion if the
version numbers in Ansible were to change away from these.

src/mmw/requirements/base.txt

@@ -24,10 +24,8 @@ https://bitbucket.org/jurko/suds/get/94664ddd46a6.tar.gz#egg=suds-jurko
 django_celery_results==1.0.1
 pandas==0.22.0
 git+git://github.com/emiliom/ulmo@wml_values_md#egg=ulmo
-numpy==1.14.5
 hs_restclient==1.2.10
 six==1.11.0
 fiona==1.7.11
 timeout-decorator==0.4.0
-numba==0.38.1
 redis==2.10.6