Work on menu

Issue #29. Set the onion skin menu entries up. Started working on
Open/Save menu entries. Also removed Project from Application -
MainWIndow is now the root for Project.
Merge branch 'master' of https://github.com/mkacz91/apricot

Conflicts:
	src/main/main.cpp
	src/main/mainwindow.cpp
Opening/Saving works

Issue #29
Merge branch 'master' of https://github.com/mkacz91/apricot