Fixed typecasting error.
Fixed typecasting error.

Fixed
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* The ufunc, around, was producing a float array but was passed an int
  array for output.

landlab/landlab,amandersillinois/landlab,cmshobe/landlab,csherwood-usgs/landlab,SiccarPoint/landlab,landlab/landlab,RondaStrauch/landlab,ManuSchmi88/landlab,ManuSchmi88/landlab,cmshobe/landlab,Carralex/landlab,Carralex/landlab,landlab/landlab,decvalts/landlab,RondaStrauch/landlab,Carralex/landlab,amandersillinois/landlab,csherwood-usgs/landlab,ManuSchmi88/landlab,laijingtao/landlab,RondaStrauch/landlab,SiccarPoint/landlab,cmshobe/landlab,laijingtao/landlab,decvalts/landlab