added a few new components and a location to the label handling dictionary
added two new functions to the data frame. first an explore function that aims to give a brief overview of the data frame.  second a convert function that performs unit conversion on a column, collection of columns, or a group of columns containing the same dimension to a new unit
added a new test file containing economizer fault test measurements.
mad a unit handling tutorial and have temporarily placed it in the main directory. i will move it to a a notebook directory once i add setup.py