adding character test for nml argName
added 'pretty.nml()' for formatting nml output
export for pretty.nml()
help for pretty.nml()
fixed typos in help
support for argList added to set.nml() help
added private function for setting nml from list
v0.1.5 added nml list arg support, pretty print function for nmls
Merge pull request #25 from jread-usgs/master

v0.1.5 added nml list arg support, pretty print function for nmls