This behavior is now more like other utilities where specifying the flag
multiple times extends the value of the argument.  For example,
    -e '.nc .h5 .zip'
becomes
    -e '.nc' -e '.h5' -e '.zip'

This is less fragile for the user and possibly less confusing how the
argument should be formatted on the command line.

I did it this way so each file could be compressed without hard-coding
the compression algorithm. But I could see this being used to run a
pre-processing script on each downloaded file.

Don't consume all arguments after --extensions

Add ability to execute arbitrary commands on each downloaded file

* Develop (#32)

* Don't consume all arguments after --extensions

This behavior is now more like other utilities where specifying the flag
multiple times extends the value of the argument.  For example,
    -e '.nc .h5 .zip'
becomes
    -e '.nc' -e '.h5' -e '.zip'

This is less fragile for the user and possibly less confusing how the
argument should be formatted on the command line.

* Add ability to execute arbitrary commands on each downloaded file

I did it this way so each file could be compressed without hard-coding
the compression algorithm. But I could see this being used to run a
pre-processing script on each downloaded file.

* updated README and tests for additive -e examples

* force 'action'

* merged code for extensions, process call, and updated documentation

* fix for #28

* updated CHANGELOG

Co-authored-by: Joe Sapp <joe.sapp@noaa.gov>
Co-authored-by: mgangl <mike.gangl@gmail.com>

* closes #33
added 'files to download' to non-verbose output

* updated changelog

Co-authored-by: Joe Sapp <joe.sapp@noaa.gov>
Co-authored-by: mgangl <mike.gangl@gmail.com>