prepare for 2.0.0-alpha release.

apps/advanced/composer.json

@@ -12,7 +12,7 @@
 		"irc": "irc://irc.freenode.net/yii",
 		"source": "https://github.com/yiisoft/yii2"
 	},
-	"minimum-stability": "dev",
+	"minimum-stability": "alpha",
 	"require": {
 		"php": ">=5.4.0",
 		"yiisoft/yii2": "*",

apps/basic/composer.json

@@ -12,7 +12,7 @@
 		"irc": "irc://irc.freenode.net/yii",
 		"source": "https://github.com/yiisoft/yii2"
 	},
-	"minimum-stability": "dev",
+	"minimum-stability": "alpha",
 	"require": {
 		"php": ">=5.4.0",
 		"yiisoft/yii2": "*",

apps/benchmark/composer.json

@@ -15,7 +15,7 @@
 	"config": {
 	  "vendor-dir": "protected/vendor"
 	},
-	"minimum-stability": "dev",
+	"minimum-stability": "alpha",
 	"require": {
 		"php": ">=5.4.0",
 		"yiisoft/yii2": "*"

framework/CHANGELOG.md

@@ -1,7 +1,7 @@
 Yii Framework 2 Change Log
 ==========================
 
-Version 2.0 alpha
------------------
+2.0 alpha, December 1, 2013
+---------------------------
 
 - Initial release.