Demo program fix

Issue #14 addressed.

Documentation Release

Changed the code comment style to Doxygen format and implemented Travis-CI

Issue #4
Issue #5
Issue #6
Issue #7

Bug Fix Release

Enhancement #3 and DOI

Fixed occasional bad reading

Issue #2 fix implemented

Added optional "reverse" parameter to begin() method

If the thermocouple leads are reversed then the probe temperature value goes down as the temperature goes up. Normally the wires should be connected correctly, but setting this option allows the library to function correctly with reversed leads.

Initial Release

Initial release after debugging and local testing using a K-Type thermocouple and on a Arduino ATMega and Arduino Micro using both hardware and software SPI