Description

Make regex patterns case insensitive and transform keyword string to lowercase before running check.

Closes #80.

Changes

• Make regex patterns case insensitive (except keyword pattern)
• Transform keyword string to lowercase before running check
• Add tests for uppercase letters

Testing

• Be on master
• Call the library with named color with uppercase letters: cs.get("BLUE")
• Note that a null value is returned
• Switch to this branch
• Call the library with named color with uppercase letters: cs.get("BLUE")
• Note that an array of numbers is returned representing the named color

Notes

• Per spec, any keyword should be case insensitive. This includes named colors and functional notations.