Add awful.util.round

lib/awful/util.lua

@@ -27,6 +27,7 @@ local capi =
     awesome = awesome,
     mouse = mouse
 }
+local floor = math.floor
 
 local util = {}
 util.table = {}
@@ -526,6 +527,13 @@ function util.query_to_pattern(q)
     return s
 end
 
+--- Round a number to an integer.
+-- @tparam number x
+-- @treturn integer
+function util.round(x)
+    return floor(x + 0.5)
+end
+
 return util
 
 -- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80