centeredmaster patch

- Apply centeredmaster patch
- Add patch link to README
- Add new layout keybindings to man page

config.h

@@ -49,6 +49,8 @@ static const Layout layouts[] = {
 	{ "[]=",      tile },    /* first entry is default */
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "|M|",      centeredmaster },
+	{ ">M>",      centeredfloatingmaster },
 };
 
 /* key definitions */
@@ -104,6 +106,8 @@ static Key keys[] = {
 	{ MODKEY,               XK_t,						setlayout,      {.v = &layouts[0]} },
 	{ MODKEY,               XK_f,						setlayout,      {.v = &layouts[1]} },
 	{ MODKEY,               XK_m,						setlayout,      {.v = &layouts[2]} },
+	{ MODKEY,				XK_u,						setlayout,		{.v = &layouts[3]} },
+	{ MODKEY,				XK_o,						setlayout,		{.v = &layouts[4]} },
 	{ MODKEY,               XK_space,					setlayout,      {0} },
 	{ MODKEY|ShiftMask,     XK_space,					togglefloating, {0} },
 	{ MODKEY,               XK_0,						view,           {.ui = ~0} },