Updating changlog and releases for 1.6

CHANGELOG.md

 Ansible Changes By Release
 ==========================
 
-## 1.6 "And the Cradle Will Rock" - Active Development
+## 1.6 "And the Cradle Will Rock"
 
 Major features/changes:
 

RELEASES.txt

 Ansible Releases at a Glance
 ============================
 
-Future
-++++++
-
-1.7    "Summer Nights" -------- SUMMER 2014
-
 Active Development
 ++++++++++++++++++
 
-1.6    "The Cradle Will Rock" - CURRENT DEVEL BRANCH 
-
-Previous
-++++++++
+1.7    "Summer Nights" -------- CURRENT DEVEL BRANCH
 
-=======
-1.6    "The Cradle Will Rock" - NEXT 
+1.6    "The Cradle Will Rock" - 05-05-2014
 1.5.5  "Love Walks In" -------- 04-18-2014
 1.5.4  "Love Walks In" -------- 04-01-2014
 1.5.3  "Love Walks In" -------- 03-13-2014