Provide more delimiters

This adds \lgroup, \rgroup, \lmoustache and \rmoustache,
provides \lVert and \rVert with the correct type for each,
and makes \lvert, \rvert, \lVert and \rVert available
through \left...\right.

src/delimiter.js

@@ -217,6 +217,26 @@ var makeStackedDelim = function(delim, heightTotal, center, options, mode) {
         bottom = "\u23ad";
         repeat = "\u23aa";
         font = "Size4-Regular";
+    } else if (delim === "\\lgroup") {
+        top = "\u23a7";
+        bottom = "\u23a9";
+        repeat = "\u23aa";
+        font = "Size4-Regular";
+    } else if (delim === "\\rgroup") {
+        top = "\u23ab";
+        bottom = "\u23ad";
+        repeat = "\u23aa";
+        font = "Size4-Regular";
+    } else if (delim === "\\lmoustache") {
+        top = "\u23a7";
+        bottom = "\u23ad";
+        repeat = "\u23aa";
+        font = "Size4-Regular";
+    } else if (delim === "\\rmoustache") {
+        top = "\u23ab";
+        bottom = "\u23a9";
+        repeat = "\u23aa";
+        font = "Size4-Regular";
     } else if (delim === "\\surd") {
         top = "\ue001";
         bottom = "\u23b7";
@@ -312,7 +332,9 @@ var stackLargeDelimiters = [
 var stackAlwaysDelimiters = [
     "\\uparrow", "\\downarrow", "\\updownarrow",
     "\\Uparrow", "\\Downarrow", "\\Updownarrow",
-    "|", "\\|", "\\vert", "\\Vert"
+    "|", "\\|", "\\vert", "\\Vert",
+    "\\lvert", "\\rvert", "\\lVert", "\\rVert",
+    "\\lgroup", "\\rgroup", "\\lmoustache", "\\rmoustache"
 ];
 
 // and delimiters that never stack

src/functions.js

@@ -205,6 +205,8 @@ var delimiters = [
     "\\{", "\\lbrace", "\\}", "\\rbrace",
     "\\lfloor", "\\rfloor", "\\lceil", "\\rceil",
     "<", ">", "\\langle", "\\rangle",
+    "\\lvert", "\\rvert", "\\lVert", "\\rVert",
+    "\\lgroup", "\\rgroup", "\\lmoustache", "\\rmoustache",
     "/", "\\backslash",
     "|", "\\vert", "\\|", "\\Vert",
     "\\uparrow", "\\Uparrow",

src/symbols.js

@@ -1946,6 +1946,11 @@ var symbols = {
             group: "open",
             replace: "\u2223"
         },
+        "\\lVert": {
+            font: "main",
+            group: "open",
+            replace: "\u2225"
+        },
         ")": {
             font: "main",
             group: "close"
@@ -1972,6 +1977,11 @@ var symbols = {
             group: "close",
             replace: "\u2223"
         },
+        "\\rVert": {
+            font: "main",
+            group: "close",
+            replace: "\u2225"
+        },
         "=": {
             font: "main",
             group: "rel"