ENH: Update Sphinx for ITK 4.8.0
ENH: Update Sphinx for ITK 4.8.0

Change-Id: I55573c60466a88a805c6e2a096021e4c49933f91

fbudin69500/ITK,malaterre/ITK,hjmjohnson/ITK,zachary-williamson/ITK,LucasGandel/ITK,blowekamp/ITK,thewtex/ITK,LucasGandel/ITK,malaterre/ITK,thewtex/ITK,LucasGandel/ITK,vfonov/ITK,zachary-williamson/ITK,vfonov/ITK,hjmjohnson/ITK,jcfr/ITK,richardbeare/ITK,malaterre/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,jcfr/ITK,blowekamp/ITK,richardbeare/ITK,stnava/ITK,malaterre/ITK,Kitware/ITK,Kitware/ITK,BRAINSia/ITK,thewtex/ITK,spinicist/ITK,blowekamp/ITK,vfonov/ITK,spinicist/ITK,stnava/ITK,fbudin69500/ITK,PlutoniumHeart/ITK,spinicist/ITK,fbudin69500/ITK,hjmjohnson/ITK,fbudin69500/ITK,blowekamp/ITK,thewtex/ITK,richardbeare/ITK,vfonov/ITK,jcfr/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,malaterre/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,spinicist/ITK,BRAINSia/ITK,hjmjohnson/ITK,stnava/ITK,spinicist/ITK,zachary-williamson/ITK,jcfr/ITK,LucasGandel/ITK,stnava/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,PlutoniumHeart/ITK,LucasGandel/ITK,BRAINSia/ITK,LucasGandel/ITK,PlutoniumHeart/ITK,stnava/ITK,LucasGandel/ITK,zachary-williamson/ITK,spinicist/ITK,fbudin69500/ITK,spinicist/ITK,vfonov/ITK,fbudin69500/ITK,jcfr/ITK,InsightSoftwareConsortium/ITK,PlutoniumHeart/ITK,zachary-williamson/ITK,jcfr/ITK,zachary-williamson/ITK,zachary-williamson/ITK,fbudin69500/ITK,fbudin69500/ITK,blowekamp/ITK,Kitware/ITK,hjmjohnson/ITK,malaterre/ITK,PlutoniumHeart/ITK,vfonov/ITK,hjmjohnson/ITK,spinicist/ITK,BRAINSia/ITK,richardbeare/ITK,Kitware/ITK,PlutoniumHeart/ITK,malaterre/ITK,vfonov/ITK,PlutoniumHeart/ITK,malaterre/ITK,Kitware/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,stnava/ITK,blowekamp/ITK,malaterre/ITK,hjmjohnson/ITK,blowekamp/ITK,stnava/ITK,BRAINSia/ITK,thewtex/ITK,Kitware/ITK,stnava/ITK,BRAINSia/ITK,thewtex/ITK,zachary-williamson/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,blowekamp/ITK,zachary-williamson/ITK,thewtex/ITK,Kitware/ITK,stnava/ITK,vfonov/ITK,jcfr/ITK,PlutoniumHeart/ITK,jcfr/ITK