Changed to Templated Class

[hoilett]

1. Moved to a templated class to make the class more usable across different data types. This also allows the user to avoid floats and doubles in order to save space and increase processing speed. Need to decide how to deal with the invert function in a bit.

2. changed function names to have the first letter be lower case instead of upper case

3. added a print function without the "String label" parameter

4. added a scale function that doesn't modify the input matrix

5. added const to parameters where sensible

6. Added a keywords.txt file

7. Added an example for new templated implementation also using SparkFun's recommendation for naming library examples. See: "Use escalating examples" https://www.sparkfun.com/news/3245