Added JaggedArray class.
Added JaggedArray class.

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