poky.ent: Added a new variable ECLIPSE_LUNA_URL

With the support of Luna version of Eclipse, I had to create a new
variable named ECLIPSE_LUNA_URL and set it to
"&ECLIPSE_DL_URL;/releases/luna"

(From yocto-docs rev: 4c686fc8e52d608975c4fd9040fd83870419bcf0)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/poky.ent

@@ -26,6 +26,7 @@
 <!ENTITY ECLIPSE_UPDATES_URL "&ECLIPSE_DL_URL;/tm/updates/3.3">
 <!ENTITY ECLIPSE_INDIGO_URL "&ECLIPSE_DL_URL;/releases/indigo">
 <!ENTITY ECLIPSE_JUNO_URL "&ECLIPSE_DL_URL;/releases/juno">
+<!ENTITY ECLIPSE_LUNA_URL "&ECLIPSE_DL_URL;/releases/luna">
 <!ENTITY ECLIPSE_KEPLER_URL "&ECLIPSE_DL_URL;/releases/kepler">
 <!ENTITY ECLIPSE_INDIGO_CDT_URL "&ECLIPSE_DL_URL;/tools/cdt/releases/indigo">
 <!ENTITY YOCTO_DOCS_URL "&YOCTO_HOME_URL;/docs">