beautified display results slightly and removed unecessary .toString() because Java does implicit conversion for me
worked on display of difference
fixed spacing issues
unified layout to medium text and width=match_parent
fixed typo on product display
first round refactoring of mathify funciton
begin separation of concerns for main activity
moved difference functionality
moved multiplication functionality
moved quotient 1 & 2 functionality
moved modulo 1 & 2 functionality
Merge pull request #7 from fnc314/main_activity_refactor_1

Main activity refactor 1