Pytelemetrycli

Baudspeed, amount of received data, etc can now be plotted and dealt with like normal topics.

`ls -c` or `ls --cli` to list available CLI topics

pub` with integer flags (ex : `--i16`) while sending a decimal number (`0.0`) will now pass if rounded number is close from entered number. Otherwise, it will trigger an error message and cancel the publish.
The `isclose` function that determines whether two floating numbers are close is directly drawn from python standard library

- Fixed requirement `pytelemetry>1.1.6` impossible to be met.

- 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.