[Bug 408372] [sidebar] Navigator actions should target the root folder, if no selection made in file list
[Bug 408372] fix rename of treeRoot when it's a project
[Bug 408372] Refactor fileCommands to dispatch model change events
-Explorers listen and update themselves
-Use appropriate param collector (popup for treeRoot vs inplace)
[Bug 408372] Fix bad param collector when Renaming the nav root
[Bug 408372] Make full-page Nav target the root folder, if no selection made in list
- fix fileCommands.updateNavTools() to allow targeting explorer root when no selection is made
[Bug 408372] Make explorers react correctly to treeRoot rename, share code
[Bug 408372] Make explorers react correctly to treeRoot delete
bumping min version of firefox to 20