chore - publish rockspec and add luarocks instructions

sandbox-1.0.0-0.rockspec

@@ -0,0 +1,24 @@
+package = "sandbox"
+
+version = "1.0.0-0"
+
+source = {
+   url = "git://github.com/kikito/sandbox.lua.git",
+   tag = "v1.0.0"
+}
+
+description = {
+   summary = "A pure-lua solution for running untrusted Lua code.",
+   homepage = "https://github.com/kikito/sandbox.lua",
+}
+
+dependencies = {
+   "lua >= 5.1",
+}
+
+build = {
+   type = "builtin",
+   modules = {
+      ["sandbox"] = "sandbox.lua",
+   }
+}