User guide.
JTable properties.
Bug fixing and refactoring.
small fix
Objects on structure tree.
Object deleting on structure tree.
Simple object properties.
Poprawa literowki
Dodanie popup menu do preview
Merge branch 'kvasnyk' of https://github.com/lechoPl/GameMaker into pawel

Conflicts:
	GameMakerEditor/src/gui/gameview/LevelPreview.java
Dodanie odswiezanie structuretree
Dodany dwuklik
Merge remote-tracking branch 'origin/master' into michal