Added STTDataPoint class. Updated UML.

STTDataPoint is a simple container to hold a saturation, a temperature,
and a timestamp value. Intended for use with a DataStream as the
DataType. The STTDataPointClass has passed unit testing; has not been
integrated into the rest of the code.
Made the burnup chart a little fancier.

.ods is libreoffice Calc file format. See .pdf file if you don't have
libreoffice. FYI libreoffice is an opensource offshoot of openoffice, so
it is free.
Integrated STTDataPointClass. Working version.
Started writing library installation instructions.

Committing to prepare for pull/push
Merge branch 'master' of https://github.com/eshughes93/Smart-Irrigation-Project