Merge pull request #6 from delatbabel/master

Latest updates
Made some changes.

Added DPT and HDG NMEA messages.
Changed code to always show the last line on the bottom line.
Merge pull request #14 from ptulp/master

Added DPT and HDG messages and code to always show the last line on the bottom line.
Bump version number
Update install and help notes
Remove duplication