updated dev composer.json dependencies

also removed composer plugin and added it to requirements
this way the plugin is recognized by composer. would not work otherwise.

setting the repo type to yii2-extension also allows us to run composer
plugin and let it handle the extensions in this package

composer.json

@@ -3,7 +3,7 @@
 	"description": "Yii2 Web Programming Framework - Development Package",
 	"keywords": ["yii", "framework"],
 	"homepage": "http://www.yiiframework.com/",
-	"type": "library",
+	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"authors": [
 		{
@@ -65,7 +65,6 @@
 	},
     "replace": {
         "yiisoft/yii2-bootstrap": "self.version",
-        "yiisoft/yii2-composer": "self.version",
         "yiisoft/yii2-debug": "self.version",
         "yiisoft/yii2-gii": "self.version",
         "yiisoft/yii2-jui": "self.version",
@@ -79,14 +78,18 @@
 		"ext-mbstring": "*",
 		"lib-pcre": "*",
 		"yiisoft/jquery": "1.10.*",
+		"yiisoft/yii2-composer": "self.version",
 		"phpspec/php-diff": ">=1.0.2",
 		"ezyang/htmlpurifier": "4.5.*",
-		"michelf/php-markdown": "1.3.*"
+		"michelf/php-markdown": "1.3.*",
+		"twbs/bootstrap": "3.0.*",
+		"smarty/smarty": "*",
+		"swiftmailer/swiftmailer": "*",
+		"twig/twig": "*"
 	},
 	"autoload": {
 		"psr-0": {
             "yii\\bootstrap": "/extensions/bootstrap/",
-			"yii\\composer": "/extensions/composer/",
 			"yii\\debug": "/extensions/debug/",
 			"yii\\gii": "/extensions/gii/",
 			"yii\\jui": "/extensions/jui/",