add a cool lua repl

lib/lua-repl/RELEASE-GUIDE.md

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+# lua-repl release guide
+
+  - [ ] Bump VERSION (in repl/init.lua, look for references to current version)
+  - [ ] Update Changelog
+  - [ ] Rename and update rockspec
+  - [ ] Make sure tests pass
+  - [ ] Push & tag latest release
+  - [ ] Submit rockspec to luarocks
+  - [ ] E-mail lua-l
+  - [ ] Submit lua-l gmane link to reddit
+
+## E-mail template for lua-l
+
+Hi Lua users,
+
+I have just released version {{VERSION}} of lua-repl, an alternative to the
+standalone REPL included with Lua and a library for embedding a Lua
+REPL within a Lua application.
+
+lua-repl provides a library for adding a Lua REPL to your Lua-powered
+application.  It also provides an example REPL in the form of rep.lua,
+which can take the place of the standalone interpreter provided with
+Lua.  It has a plugin facility; plugins for things like history and tab
+completion of symbols are included in the lua-repl distribution.
+
+{{CHANGES}}
+
+You can install lua-repl via Luarocks (called luarepl there), or
+manually from the source [{{REFERENCE}}].
+
+-Rob
+
+[{{REFERENCE}}] https://github.com/hoelzro/lua-repl/archive/0.8.tar.gz
+