Pytelemetry

- Fixed pub with negative numbers
- Improved testing. Setup CI on travis and appveyor
- New command `stats` for displaying information about health of serial port, protocol, etc

Note : Actual release is next commit https://github.com/Overdrivr/pytelemetrycli/commit/136f76e6c4a94ee2fff956cd6c1c893cfca52f82
- CLI behavior is logged
- raw protocol data is logged
- Multi-plots support (open multiple plots, reopen closed plots on some topics)
- Plots closed once on a topic can be reopened
- bugfixes and various improvements

Indexed topics such as
`topic:123` are now understood and treated as unique ids for plotting, topics, etc.

Package can now be installed on Windows Python3.5+ with pip
Wrote some gradle scripts to facilitate preparation for pypi upload

Full fonctionnality
Test coverage 99%