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/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",