Some changes and optimizations to the ImageViewer class

[quelcom]

• Layout changes
• Testing the NFC tags provided with some pictures of the Design Factory
• Code optimizations and refactoring

[jush]

Could you remove the binary files (/bin folder)

[gerard]

You might want to use git filter-branch again to remove the bin/ directory from the whole repository in one command. You can still do it commit by commit, but it might be more tedious.