added 2 tools for lidar

added a dtm from Lidar tool and a dsm from lidar tool
Tool fixes from Matt

Updated the output mosaic datasets as parameters
Merge pull request #92 from NatalieCampos/master

added 2 tools for lidar
Description and Alias updates for issue #56

Description and Alias updates to toolboxes
https://github.com/Esri/solutions-geoprocessing-toolbox/issues/56
Merge pull request #93 from mfunk/master

Description and Alias updates for issue #56