A CLI tool for geomet.

@larsbutler are you interested in a CLI tool for geomet? This one uses click instead of argparse or optparse and works like this (round trip of WKT through WKB):

```
$ echo "POINT (0.9999999 0.9999999)" | python -m geomet.tool --wkb | python -m geomet.tool --wkt --precision 7
POINT (0.9999999 0.9999999)
```

Its general usage:

```
$ python -m geomet.tool --help
Usage: tool.py [OPTIONS]

Options:
  -v, --verbose        Increase verbosity.
  -q, --quiet          Decrease verbosity.
  --json               JSON output.
  --wkb                WKB output.
  --wkt                WKT output.
  --precision INTEGER  Decimal precision of JSON and WKT coordinates.
  --indent INTEGER     Indentation level for pretty printed output
  --help               Show this message and exit.
```