updated buttons
changed button text
	modified:   popup.cpp
	modified:   popup.h
	modified:   popup.ui
Edited popup class, now has an error on Node.getColour()
Passed caller as parameter in the Popup class, to prevent accessing caller
before it was initiated.
node highlighted
Made popup class look more 'modern'
Merge branch 'test' of https://github.com/SEGroup10/IntelliGraph into test
Merge pull request #3 from SEGroup10/Cedric

Cedric
Added image resource file and app icon
Merge branch 'test' of https://github.com/SEGroup10/IntelliGraph into test
Added application icon
Manual merge from origin/Dico

Manual merge
Added icons

icons that can be used
Merge remote-tracking branch 'origin/test' into Dico

Conflicts:
	IntelliGraph/mainwindow.ui