specify multiple keys for single command #55

This code still doesn't support different modifiers on keys, but
I would rather refactor it in small steps first

Current changes adds support for Kindle 3 left page keys
reported by @houqp in issue #55

commands.lua

@@ -62,8 +62,15 @@ Commands = {
 	size = 0
 }
 function Commands:add(keycode,modifier,keydescr,help,func)
-	local keydef = Keydef:new(keycode,modifier,keydescr)
-	self:_addImpl(keydef,help,func)
+	if type(keycode) == "table" then
+		for i=1,#keycode,1 do
+			local keydef = Keydef:new(keycode[i],modifier,keydescr)
+			self:_addImpl(keydef,help,func)
+		end
+	else
+		local keydef = Keydef:new(keycode,modifier,keydescr)
+		self:_addImpl(keydef,help,func)
+	end
 end
 function Commands:addGroup(keygroup,keys,help,func)
 	for _k,keydef in pairs(keys) do

unireader.lua

@@ -875,12 +875,12 @@ end
 -- command definitions
 function UniReader:addAllCommands()
 	self.commands = Commands:new()
-	self.commands:add(KEY_PGFWD,nil,">",
+	self.commands:add({KEY_PGFWD,KEY_LPGFWD},nil,">",
 		"next page",
 		function(unireader)
 			unireader:goto(unireader:nextView())
 		end)
-	self.commands:add(KEY_PGBCK,nil,"<",
+	self.commands:add({KEY_PGBCK,KEY_LPGBCK},nil,"<",
 		"previous page",
 		function(unireader)
 			unireader:goto(unireader:prevView())