prepare for 2.0.7 release
prepare for 2.0.7 release

subdee/myportugal,Somefive/Athena,erycamel/yii2-app-advanced,Somefive/Athena,dmitry-kulikov/yii2-app-advanced,dmitry-kulikov/yii2-app-advanced,subdee/myportugal,cophiel/YII2-Learning,AnTAVR/yii2-app-advanced-ru,githubjeka/yii2-app-advanced,yiijan/yii2-app-advanced,cophiel/YII2-Learning,mobilejazz/yii2-mj-cms-example,tibrus/yii2-app-advanced,yiisoft/yii2-app-advanced,AnTAVR/yii2-app-advanced-ru,nikbas/yii2-app-advanced,nikbas/yii2-app-advanced,urmaul/yii2-app-advanced-mongodb,AnTAVR/yii2-app-advanced-ru,yiisoft/yii2-app-advanced,erycamel/yii2-app-advanced,dixonsatit/yii2-dixon-starter,vitezmiklos/test,githubjeka/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,dixonsatit/yii2-dixon-starter,yiijan/yii2-app-advanced