[OE-core] Add lua to oe-core.

[Randy MacLeod]

I've found that many projects use the lua scripting language.
I'd like to move it from meta-oe to oe-core:

 
http://cgit.openembedded.org/cgit.cgi/meta-openembedded/tree/meta-oe/recipes-devtools/lua/lua5.1_5.1.5.bb?h=master

http://www.lua.org/about.html

lua-5.2.2 is current, see: http://www.lua.org/download.html
so we'd likely uprev and send that version.

rpm and lighttpd could (would?) optionally depend on lua.

oe-core.git $ grep -r lua * | egrep -v 'valuat|valuable|uargp|rpm'
meta/recipes-extended/lighttpd/lighttpd_1.4.32.bb:
              --without-lua \

Any comments pro or con before we do the uprev, testing and send
a commit?
-- 
# Randy MacLeod. SMTS, Linux, Wind River
Direct: 613.963.1350