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
Merge pull request #2 from cuspaceflight/makefile

Escape the arduino IDE, and use a Makefile