Split the SIP directory into two directories.

Having both the sensor arduino and water arduino in the same directory
and using preprocessor commands to switch between them in the .ino file
was both confusing and tedious to use. Having two separate directories,
one for sensor_arduino.ino and one for water_arduino.ino, is much easier
to use. This also reduces duplicated (yet dependent) code between
SIP.ino and the two arduino files.
Removed the SIP directory.

The SIP directory has been made obsolete by splitting it into two
directories (sensor_arduino and water_arduino).
Merge branch 'master' of https://github.com/eshughes93/Smart-Irrigation-Project
Added includes for Time.h