Pybbio

* Added library and exampes for Panasonic Grid-EYE 8x8 thermal sensor array
* Updated MAX31855 library to use SPI module instead of soft SPI
* Switched to using separate [serbus](https://github.com/graycatlabs/serbus) package for SPI and I2C
* Standardized [version numbering](https://github.com/graycatlabs/PyBBIO/wikiversion-numbering)

* Added ADXL345 3-axis accelerometer library and example
* Only allow I2C, SPI and UART initialization one time
* Better error handling in interrupt routines

* Fixed incorrect I2C bus initialization (which caused I2C2 not to work)
* Updated to Contributor Covenant Code of Conduct 1.2.0
* Added requests package to dependencies

* Install examples to /usr/local/lib/PyBBIO/examples/
* Implemented proper bus number detection for SPI and I2C

* New libraries
* BMP183 SPI pressure sensor
* HTU21D I2C RH sensor
* IoT
* Phant
* ThingSpeak
* Added I2C1/I2C2 alternative names for Wire1/Wire2
* Fixed a memory leak in the SPI and I2C C extensions

* Created a new C SPI driver and C extension for it to replace the old
spimodule code. Should be a good performance improvement
* Fixed a couple memory leaks in C extensions
* Fixed a missing type check in sysfs C extension. Was causing RotaryEncoder
library to fail
* Fixed the tests/library_test.py example file