pathbar: add a path-event signal

This will be useful to remove some hairy code from NautilusWindowPane
window-pane: use the path-event signal from NautilusPathBar

Simplifies code quite a bit.
pathbar: remove unused code

The path-set signal has no listeners connected anymore, so it can be
safely removed.
Added Norwegian bokmål translation
Use new GTK bookmarks location

If it doesn't exist fallback to reading from the old location but
always write to the new location.

https://bugzilla.gnome.org/show_bug.cgi?id=674986
bookmark-list: make sure to avoid sync I/O while loading/saving

Last patch introduces sync I/O in the load and save paths; avoid that by
explicitly using separate threads for saving and loading, thanks to
g_simple_async_result_run_in_thread().
editable-label: don't use deprecated gtk_draw_insertion_cursor()

Replace the calls with gtk_render_insertion_cursor()
build: add nautilus-app-menu.ui to EXTRA_DIST

Needed for distcheck.
bookmarks-window: fix wrong include path
release: prepare for 3.5.1
Merge commit '875efc324f8e91f2d157c7532fe5570c1de421c7' into nemo_master_merge

Conflicts:
	src/nemo-pathbar.c
	src/nemo-pathbar.h
	src/nemo-window-pane.c
Merge commit 'ed9057711896dd71a6e1524b9fcf963b9adb24c0' into nemo_master_merge

Conflicts:
	po/nb.po
	src/nemo-bookmark-list.c
Merge commit 'e098781b3ede80517ceea56daa7f5a8c1c95f2af' into nemo_master_merge

Conflicts:
	src/nemo-bookmark-list.c
Merge tag '3.5.1' into nemo_master_merge

Release 3.5.1

Conflicts:
	NEWS
	configure.in
	src/Makefile.am
	src/nemo-bookmarks-window.c