This version releases the `tpb` and `pb-notify` programs as well as some
accompanying scripts.

* multiple output formats:
  * for standalone usage, nice human-readable formatting; and
  * for usage in scripts, tabular output as JSON separated values.
* list devices.
* list SMS threads on a device.
* list contents of an SMS thread on a device, either:
  * by thread ID; or
  * by fuzzy-matching the recipient's name to find the thread ID.
* send SMS, either :
  * by giving an explicit phone number; or
  * by fuzzy-matching the recipient's name to find their phone number.

tpb requires no configuration if you fill out all the command line options, but
some options that are used everywhere (like the Pushbullet API key and the
device ID, assuming you use only one device) can be specified via environment
variables.

* API key configuration via environment variables.
* Any SMS received on any Pushbullet device associated to the API key will be
  shown as a desktop notification via libnotify.