Added Reverse Function
Minor Update to NumericFile Class

Bug Fixes
-Fixed a bug where not all entries would have a function applied to them
in the applyFunctionToEntriesInLines function
Documentation
-Added documentation to the rest of the functions
New Functions
-computeVarianceOfContents
-computeStandardDeviationOfContents
Style Changes
-made the loadFromFile function more consistent with the style of
similar functions