Serbian Translation 1.1

updated text and change filename to sr_RS
delete sr_sr.pot sr_rs.mo
new sr_RS.pot and sr_RS.mo
Add translation to list
wp_nav_menu() 'depth' argument now works

the depth of the submenus is forced to 2 levels, hence wp_nav_menu's depth argument was not being used.

now a user can set the desired depth and the menu item with a submenu won't display the parent menu 'caret' when depth is set to 1 (level)
Revert "wp_nav_menu() 'depth' argument now works"

This reverts commit 4d605dba46d1c8d8cbe574b3ba99b704ddd51b38.
wp_nav_menu 'depth' argument is now being used
Merge branch 'master' of https://github.com/toriqo/roots