ENH: enable colors for `runtests.py --ipython`
ENH: enable colors for `runtests.py --ipython`

Currently the IPython shell from runtests has no colors; enable them.

jakirkham/numpy,numpy/numpy,mhvk/numpy,jakirkham/numpy,seberg/numpy,mhvk/numpy,madphysicist/numpy,pdebuyl/numpy,madphysicist/numpy,charris/numpy,simongibbons/numpy,grlee77/numpy,charris/numpy,rgommers/numpy,charris/numpy,charris/numpy,numpy/numpy,pbrod/numpy,pbrod/numpy,mhvk/numpy,mhvk/numpy,seberg/numpy,simongibbons/numpy,pdebuyl/numpy,madphysicist/numpy,pbrod/numpy,grlee77/numpy,mattip/numpy,jakirkham/numpy,simongibbons/numpy,mhvk/numpy,jakirkham/numpy,numpy/numpy,rgommers/numpy,anntzer/numpy,grlee77/numpy,madphysicist/numpy,grlee77/numpy,simongibbons/numpy,pbrod/numpy,mattip/numpy,rgommers/numpy,mattip/numpy,madphysicist/numpy,endolith/numpy,anntzer/numpy,endolith/numpy,seberg/numpy,endolith/numpy,seberg/numpy,rgommers/numpy,endolith/numpy,pbrod/numpy,pdebuyl/numpy,numpy/numpy,anntzer/numpy,pdebuyl/numpy,jakirkham/numpy,anntzer/numpy,grlee77/numpy,mattip/numpy,simongibbons/numpy