given sort options is not useful in the case of commonly used directories when downloading/resuming a torrent changes the modification date. Adding a "sort by creation time" option will be helpful for sorting directories with a lot of folders in it where you keep changing the contents of the folders.
added an option in toolbar-view-menu "First Created" using which user can sort by creation time (NAUTILUS_FILE_SORT_BY_BTIME).
for this, created GtkModelButton object with id:"sort_creation_date" in nautilus-toolbar-view-menu.ui and action is specified via “action-name” and “action-target” properties.with 'creation-date' as a “action-target" and NautilusFileSortType NAUTILUS_FILE_SORT_BY_BTIME we compared files using compare_by_time() method, and sorted by creation time.
Closes : #1859