DOC: skip doctest so PyWavelets does not have to be installed on Travis
DOC: skip doctest so PyWavelets does not have to be installed on Travis

vighneshbirodkar/scikit-image,rjeli/scikit-image,paalge/scikit-image,paalge/scikit-image,rjeli/scikit-image,vighneshbirodkar/scikit-image,vighneshbirodkar/scikit-image,paalge/scikit-image,rjeli/scikit-image