Adding esc key bindings to content viewers so as to be able to get out of them without the awkward CTRL + F4 or mouse on close button
Adding double click/enter key bindings to file viewer so as to be able to get into content viewers much faster and more reliably
Adding type filter to file viewer to enable the user to browse only what they're interested in
Merge pull request #1 from LazyBui/master

Usability improvements