[doc] release date ++ formatting

CHANGELOG.rst

@@ -1,22 +1,23 @@
-0.6.0
-=====
+0.6.0 - 2014.12.25
+==================
 
--  Changelog added
--  New engines
-    -  Flickr (api)
-    -  Subtitleseeker
-    -  photon
-    -  500px
-    -  Searchcode
-    -  Searchcode doc
-    -  Kickass torrent
--  Precise search request timeout handling
--  Better favicon support
--  Stricter config parsing
--  Translation updates
--  Multiple ui fixes
--  Flickr (noapi) engine fix
--  Pep8 fixes
+- Changelog added
+- New engines
+
+  - Flickr (api)
+  - Subtitleseeker
+  - photon
+  - 500px
+  - Searchcode
+  - Searchcode doc
+  - Kickass torrent
+- Precise search request timeout handling
+- Better favicon support
+- Stricter config parsing
+- Translation updates
+- Multiple ui fixes
+- Flickr (noapi) engine fix
+- Pep8 fixes
 
 
 News