BLD: Update MANIFEST.in
BLD: Update MANIFEST.in

Exclude more development artifacts and include the `tox.ini` file.

jakirkham/numpy,ahaldane/numpy,jorisvandenbossche/numpy,rgommers/numpy,abalkin/numpy,charris/numpy,grlee77/numpy,rgommers/numpy,mattip/numpy,simongibbons/numpy,shoyer/numpy,gfyoung/numpy,mhvk/numpy,pizzathief/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,ahaldane/numpy,pizzathief/numpy,simongibbons/numpy,tynn/numpy,abalkin/numpy,madphysicist/numpy,pdebuyl/numpy,jorisvandenbossche/numpy,mhvk/numpy,anntzer/numpy,shoyer/numpy,Eric89GXL/numpy,mhvk/numpy,seberg/numpy,Eric89GXL/numpy,madphysicist/numpy,seberg/numpy,numpy/numpy,pbrod/numpy,grlee77/numpy,grlee77/numpy,seberg/numpy,WarrenWeckesser/numpy,madphysicist/numpy,mhvk/numpy,tynn/numpy,endolith/numpy,MSeifert04/numpy,numpy/numpy,Eric89GXL/numpy,jakirkham/numpy,grlee77/numpy,charris/numpy,rgommers/numpy,madphysicist/numpy,simongibbons/numpy,endolith/numpy,pizzathief/numpy,pbrod/numpy,numpy/numpy,endolith/numpy,Eric89GXL/numpy,mattip/numpy,simongibbons/numpy,WarrenWeckesser/numpy,shoyer/numpy,mattip/numpy,gfyoung/numpy,tynn/numpy,MSeifert04/numpy,charris/numpy,madphysicist/numpy,pdebuyl/numpy,WarrenWeckesser/numpy,pdebuyl/numpy,ahaldane/numpy,jorisvandenbossche/numpy,jorisvandenbossche/numpy,rgommers/numpy,seberg/numpy,ahaldane/numpy,WarrenWeckesser/numpy,pizzathief/numpy,anntzer/numpy,WarrenWeckesser/numpy,gfyoung/numpy,ahaldane/numpy,pbrod/numpy,pbrod/numpy,numpy/numpy,pizzathief/numpy,mattip/numpy,abalkin/numpy,MSeifert04/numpy,endolith/numpy,jakirkham/numpy,jakirkham/numpy,anntzer/numpy,jakirkham/numpy,MSeifert04/numpy,charris/numpy,grlee77/numpy,shoyer/numpy,shoyer/numpy,pbrod/numpy,simongibbons/numpy,mhvk/numpy,pdebuyl/numpy,anntzer/numpy