support saving function handles, close #51

Author: fangq

savejson.m

@@ -177,6 +177,8 @@
     else
         txt=matlabobject2json(name,item,level,varargin{:});
     end
+elseif(isa(item,'function_handle'))
+    txt=struct2json(name,functions(item),level,varargin{:});
 else
     txt=mat2json(name,item,level,varargin{:});
 end