lua: move Lua packages under lang/lua sub-folder

There are roughly 50 Lua packages.
It's about time we consider a proposal for moving all of them
under a lang/lua sub-folder.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/lua/lua-penlight/Makefile

@@ -0,0 +1,47 @@
+#
+# Copyright (C) 2014 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=lua-penlight
+PKG_VERSION:=1.13.1
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/Penlight-$(PKG_VERSION)
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/lunarmodules/Penlight/tar.gz/$(PKG_VERSION)?
+PKG_HASH:=530380e1a377df519c2e589f47823f79701f8e0e67f6bbd994e18d09a470b680
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE.md
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/lua-penlight
+  SUBMENU:=Lua
+  SECTION:=lang
+  CATEGORY:=Languages
+  TITLE:=Penlight
+  URL:=http://lunarmodules.github.io/Penlight/manual/01-introduction.md.html
+  DEPENDS:=+luafilesystem
+  MAINTAINER:=Karl Palsson <karlp@etactica.com>
+endef
+
+define Package/lua-penlight/description
+  It is often said of Lua that it does not include batteries.
+  Penlight is the batteries.
+endef
+
+define Build/Compile
+	echo "Nothing to compile, pure lua package"
+endef
+
+define Package/lua-penlight/install
+	$(INSTALL_DIR) $(1)/usr/lib/lua
+	$(CP) $(PKG_BUILD_DIR)/lua/pl $(1)/usr/lib/lua
+endef
+
+$(eval $(call BuildPackage,lua-penlight))