Implemented correct method of loading .ui files.
MainWindow.ui now contains some elements.
Small docstring formatting fix
Merge pull request #15 from Rubykuby/guiloadfix

Implemented correct method of loading .ui files.
Merge pull request #16 from Rubykuby/mainwindowui

MainWindow.ui now contains some elements.
Added function exponential_sum() to guided.py
Merge pull request #17 from RipCazza/newguidedfunction

Added function exponential_sum() to guided.py
Turned functions into classes.
Swapped formulae import with gui.
Merge pull request #18 from Rubykuby/logicoverhaul

Turned functions into classes.
Merge pull request #19 from Rubykuby/swapimport

Swapped formulae import with gui.