Adds release date for Cathedral

I also prepended each single digit month with a 0 for the dates to line up. Feel free to change that :) 

RELEASES.txt

 Ansible Releases at a Glance
 ============================
 
-0.8 "Cathedral" ------- pending
-0.7 "Panama" ---------- 9-06-2012
-0.6 "Cabo" ------------ 8-06-2012
-0.5 "Amsterdam" ------- 7-04-2012
-0.4 "Unchained" ------- 5-23-2012
-0.3 "Baluchitherium" -- 4-23-2012
+0.9 "Dreams" ---------- pending
+0.8 "Cathedral" ------- 10-19-2012
+0.7 "Panama" ---------- 09-06-2012
+0.6 "Cabo" ------------ 08-06-2012
+0.5 "Amsterdam" ------- 07-04-2012
+0.4 "Unchained" ------- 05-23-2012
+0.3 "Baluchitherium" -- 04-23-2012
 0.0.2 Untitled
 0.0.1 Untitled