added warning about appending autoloader
added warning about appending autoloader

include path will be disable so use with care!
fixes #2638

licailing/yii,Yanan1021/yii,tvs-prarthana/yii,mudrezzz/testphp,er361/yii-zadanie-somnium,sachintaware/yii,kurorido1990/dev-github,janisto/yii,longhua828/yii,intersvyaz/yii,yiichina/yii,trewor-kapusta/yii,ImAnilChaudhari/yii,tvs-prarthana/yii,YaDelivery/yii,GerrGIT/yii,mudrezzz/testphp,lubosdz/yii,mudrezzz/testphp,guber007/yii,lsjing/yii,lsjing/yii,licailing/yii,licailing/yii,YaDelivery/yii,guber007/yii,janisto/yii,er361/yii-zadanie-somnium,Corfiot/yii,auburus/yii,tvs-prarthana/yii,l3xthanzero/trackstar,marcovtwout/yii,marcovtwout/yii,Infowatch/yii,yiichina/yii,GerrGIT/yii,sachintaware/yii,Yanan1021/yii,GerrGIT/yii,lubosdz/yii,intersvyaz/yii,l3xthanzero/trackstar,scriptius/blog,l3xthanzero/trackstar,wbfree/yii-tutorial,Vartacom/yii,wbfree/yii-tutorial,makasim/PayumYiiExtensionSandbox,kurorido1990/dev-github,Vartacom/yii,auburus/yii,yiisoft/yii,makasim/PayumYiiExtensionSandbox,kurorido1990/dev-github,sachintaware/yii,longhua828/yii,makasim/PayumYiiExtensionSandbox,Corfiot/yii,longhua828/yii,yiichina/yii,er361/yii-zadanie-somnium,intersvyaz/yii,ImAnilChaudhari/yii,lsjing/yii,scriptius/blog,jackey/YiiAPI-Framework,Vartacom/yii,auburus/yii,lsjing/yii,ImAnilChaudhari/yii,scriptius/blog,marcovtwout/yii,YaDelivery/yii,tvs-prarthana/yii,auburus/yii,makasim/PayumYiiExtensionSandbox,Yanan1021/yii,lubosdz/yii,mudrezzz/testphp,lubosdz/yii,yiisoft/yii,licailing/yii,janisto/yii,jackey/YiiAPI-Framework,trewor-kapusta/yii,ImAnilChaudhari/yii,janisto/yii,softark/yii,marcovtwout/yii,phoenix3008/yii,kurorido1990/dev-github,scriptius/blog,Vartacom/yii,phoenix3008/yii,phoenix3008/yii,GerrGIT/yii,YaDelivery/yii,er361/yii-zadanie-somnium,sachintaware/yii,longhua828/yii,guber007/yii,guber007/yii,Infowatch/yii,phoenix3008/yii,softark/yii