Preparation for 2.7.0

- Removed empty 2.6.2 CHANGELOG stub
- Added date for 2.7.0 to CHANGELOG
- Updated branch aliases:
  - dev-master => 2.7-dev
  - dev-develop => 2.8-dev

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.7.0 - TBD
+## 2.7.0 - 2016-04-06
 
 ### Added
 
@@ -30,24 +30,6 @@ All notable changes to this project will be documented in this file, in reverse
 
 - Nothing.
 
-## 2.6.2 - TBD
-
-### Added
-
-- Nothing.
-
-### Deprecated
-
-- Nothing.
-
-### Removed
-
-- Nothing.
-
-### Fixed
-
-- Nothing.
-
 ## 2.6.1 - 2016-02-08
 
 ### Added

composer.json

@@ -34,8 +34,8 @@
     "prefer-stable": true,
     "extra": {
         "branch-alias": {
-            "dev-master": "2.6-dev",
-            "dev-develop": "2.7-dev"
+            "dev-master": "2.7-dev",
+            "dev-develop": "2.8-dev"
         },
         "zf": {
             "component": "Zend\\Filter",