Grove RGBDisplay enhancements

This release includes ways for RGB displays to be automatically recognised based on their backlight controller i2c address.
Previously the user had to manually specify the version while initing, causing issues if the parameter was not named.
Look at updated examples and README.md for help on how to use it.

What's Changed

• Updated helloworld example with 2 lines. by @ubidefeo in #4
• Allow SoftI2C interfaces by @sebromero in #5
• Auto-detect of RGB Display. by @ubidefeo in #6

Full Changelog: 2.0.0...2.1.0

2.0.0 - MIP compliant library

This release arranges modules into a package and fixes local imports.
MIP compliant installation via package.json is also addressed.