Add depends to library.properties. Closes JChristensen#50.

Fix buffer overrun in example sketches.

Closes JChristensen#48.

Add example sketch to test library operation.

Add function to initialize time change point member variables.

Add constructor for time zones that do not observe daylight time.

Update example sketch.

Update example sketches:

Fix compiler warnings,
Button library name change,
Shorter code for function to print date and time.

GNU GPL v3.0.

Closes JChristensen#31.

Add CONTRIBUTING.md back.

Move source files to /src.

Closes JChristensen#7. Closes JChristensen#8. Closes JChristensen#11.  Closes JChristensen#14. Closes JChristensen#20. Closes JChristensen#24.

Fix under-allocated character array in WorldClock example. Closes JCh…

…ristensen#13.