Add --version option

Very simply adds a --version command line option

Add option to ignore non-tables

Sorting now works optionally for table contents (opt-out) through the --ignore-non-tables flag

Remove unnecessary - for stdin

Standard input no longer requires explicit -

Standardize CLI

Command line interface now conforms to Unix standards. Can read from any file (including stdin) and write to any file (including stdout) with a click-standard interface.

Initial release

v0.1.0

Fix classifiers