Changed to use makefile, to allow code to be shared between sketches
Correctly handles libraries
Use a library for the barometer
Converted to use libraries for all sensors

It appears the barometer no longer works - this should be investigated.
Other sensors appear to still function
Adds delays to make barometer work, hopefully
Return NaN for error values from pressure sensor.

This has been submitted upstream to jrowberg/i2cdevlib#52
Takes less time to print one tab than 4 spaces and a comma
Use multiplication for scaling sensors

- removes oddness of conversion to radians
- multiplication is faster at a hardware level
Tidy up of some global variables
rename led variables
Records binary data

After a run, plugging into a computer and running scripts/upload.py will pull the logs off the sd card and parse them into a csv file
Staggers pressure/temperature reads, shrinking loop times to 6ms
new file on each reset
removed calibration loops
now just logs data
ready for launch, 5mins logging time
Merge pull request #5 from cuspaceflight/datalogger-david

Datalogger david