Toolbar

Main Toolbar logic
Class FileCategory implementing IFileCategory implemented. Comments moved to interface
Access modifiers added (public) to categories releated classes
Merge pull request #2 from bolek117/mwitas

Mwitas
Modifiers public added to IFileCategory interface methods
bin folder removed from repository
Modifier public removed from interfaces
Constructor changed to avoid null reference
Merge pull request #3 from bolek117/mwitas

Mwitas
Merge branch 'master' into kzielinski
Merge branch 'kzielinski'
Bin folder deleted
Conflicts resolved