pipeline bug fixes

Fixed standard input and file handling. To read from standard input use the '-i -' option otherwise commands like 'dataset create' will expect to have content passed as a command line parameter.

This release is compiled with the following library versions:

github.com/caltechlibrary/cli -- v0.0.5-pre
github.com/caltechlibrary/dataset -- v0.0.10-pre
github.com/caltechlibrary/dotpath -- v0.0.1
github.com/caltechlibrary/mkpage -- v0.0.20-dev
github.com/caltechlibrary/storage -- v0.0.2
github.com/caltechlibrary/tmplfn -- v0.0.18-dev
github.com/caltechlibrary/wsfn -- v0.0.1

GSheet integration tests skipped as that feature is still experimental.