Applying https://github.com/sparkfun/DeadOn_RTC/commit/c39db0e3e531938815ec6113d6a0f4283dbe55c0
Fix directory structure and naming convention.

This allows a user to git clone/zip-download the repo and then move/copy/symlink
the Libraries/DeadOn_RTC directory into ~/Documents/Arduino/Libraries/ and have
the example show up correctly.