Update Razor node

[msadowski]

Here are some updates I've been working on:

• Add a short pause between command is send
• Create lib file containing hopefully all of the IMU commands
• Check if the calibration data has been written successfully to the board <- this has an issue in that the checks doesn't round any numbers which will cause false positives. I might refactor this in the near future
• Read name of the tf frame from the config
• Read covariances from the config file

[joekeo]

I don't understand '_' in the for _ in range(0, 21), is this just a dump variable?

[msadowski]

Yes, this way you don't create unused variables.