This is for DexterOS 2.43

Includes a better light / color sensor easy driver.

This is what gets pulled in DexterOS 2.4.1

This has the software I2C for the distance sensor and other sensors

This is what we use in DexterOS 2.0

bring develop to master for DexterOS 2.0 (#44)

* Add Line Follower drivers and example

* Update dexter_i2c.py

Update dexter_i2c.py to be simpler and more universal by combining
functions.

* Update line_follower.py

Update line_follower.py for recent dexter_i2c.py update

* Feature/easy libraries (#35)

* Move Distance Sensor and Line Follower in here

* remove dependency on mock_package

* remove alias for read_sensors until we know if we need it (probably not)

* Feature/system wide mutex+ easydi_sensors library  (#36)

* Move Distance Sensor and Line Follower in here

* remove dependency on mock_package

* remove alias for read_sensors until we know if we need it (probably not)

* get easydi_sensors from DexterOS

* Check for overall mutex need

* Add systemwide mutex comment

* Add license header and description

* Add license header

* change year in license header

* split easydi_sensors into 3 components for systematic naming convention

* Remove copies of ifMutexAcquire and ifMutexRelease. Keep them in one file

* Be more strict in what we're pulling in from easy_mutex

* poll overall_mutex each time

* remove print statement (#37)

reconfig_bus() is now mutex protected

* feature - update documentation for the latest (#41)

* feature - configuring the environment for RTD

* feature - bulk changes to docs

* feature - add comment on how to build documentation

* feature - add part of the documentation

* feature - completing the documentation for easy sensors + tutorials

* feature - work on the tutorials + other stuff

* feature - fix the mutexes tutorial

* feature - change organization of documentation

* feature - remove an unnecessary section

* feature - show the right command for installing di-sensors

* feature - small changes

* feature - fix documentation & and missing parts

* feature - fix naming of the package

* Revert commit

* minor fixes to docs (#42)

* minor fixes to docs

* minor fixes to doc

* fix grammar

* rename safe_heading to heading_name and re-instate the parameter (#43)

* rename safe_heading to heading_name and re-instate the parameter

* rename from heading_name to convert_heading

* add punctuation

* fix - change name of method in library description section

* Remove references to line follower (#45)