=== Version 01 ===
first release of keypad library

=== Version 02 ===
added LCD port preprocessor directives
improved preprocessor error handling
corrected bug with the 'delete' function
added a 'clear' function to keypad keyboard
improved code efficiency
reduced some code redundancy
corrected a few minor bugs related to display functionality
removed the need for delay.h
updated keypad_test.c to reflect changes
updated documentation to reflect changes
added wiring instructions to the webpage