AUTHORS.txt: use email instead of github username

This decouples authorship from github, in case anyone wants to fork and
host the fork elsewhere.
Remove license reference from README
Allow read from file and use echo().

Also change to hex-encoded WKB instead of binary to make streaming
more reliable.
See also wellknown

@tmcw has been recommending "see also" sections and I like the idea. Many developers use Node and Python and benefit from links between geomet and wellknown.
Merge pull request #19 from sgillies/patch-1

See also wellknown
Handle file, stream, or text input.

Also add a CLI test.
Sort JSON keys when writing.

Make sure tox and pep8 are satisfied.
Merge pull request #18 from sgillies/geomet-file-input

Allow read from file and use echo().

Geomet (the script) should now also handle file, stream, and text input transparently.
Drop use of click.echo().

It's not for data.
Merge pull request #20 from sgillies/no-echo

Drop use of click.echo().
Merge pull request #16 from larsbutler/authors-format

AUTHORS.txt: use email instead of github username
Merge pull request #17 from larsbutler/README-correct-license

Remove license reference from README
tox.ini: cleanup

- rename `pep8` target to `flake8`
- remove `cover` target
- add coverage flags to base test env (so coverage is run with python 2
  and 3
wkt: add support for dumping empty geoms
wkt: check for invalid geojson input to `dumps`
Empty geom WIP