Can select storage device (internal/external), and some partial open file functionality
Merge pull request #22 from greuze/task/several_storage_devices

Can select storage device (internal/external)
New mandatory icon sizes and some other minor changes
Merge pull request #23 from greuze/task/new_icons_and_minor_changes

New mandatory icon sizes and some other minor changes
Initial folder navigation
Merge pull request #26 from greuze/task/folder_navigation

Initial folder navigation
Finished folder navigation
Merge pull request #30 from greuze/task/folder_navigation

Finished folder navigation
Merge pull request #31 from greuze/develop

First fully funcional version