fixed travis and composer issue

.travis.yml

@@ -10,7 +10,7 @@ services:
 
 before_script:
   - composer self-update && composer --version
-  - composer require satooshi/php-coveralls 0.6.*
+  - composer require satooshi/php-coveralls 0.6.* --dev
   - mysql -e 'CREATE DATABASE yiitest;';
   - psql -U postgres -c 'CREATE DATABASE yiitest;';
   - tests/unit/data/travis/apc-setup.sh

composer.json

@@ -78,7 +78,7 @@
 		"ext-mbstring": "*",
 		"lib-pcre": "*",
 		"yiisoft/jquery": "1.10.*",
-		"yiisoft/yii2-composer": "self.version",
+		"yiisoft/yii2-composer": "*",
 		"phpspec/php-diff": ">=1.0.2",
 		"ezyang/htmlpurifier": "4.5.*",
 		"michelf/php-markdown": "1.3.*",