pretty good selection + rename functionality

app/components/button/upload.hbs

app/components/commander/action_buttons.hbs

app/components/commander/action_buttons.js

app/components/commander/index.hbs

app/components/commander/index.js

app/components/document.hbs

app/components/document.js

app/components/documents.js

app/components/folder.hbs

app/components/folder.js

app/components/modal/rename_node.hbs

app/components/modal/rename_node.js

app/components/node.js

app/styles/node.scss