Add backslash prefix to import checks 
Add backslash prefix to import checks 

This fixes the bug which the code can't eliminate the dependency where the class is defined as `App\ModelName` but the compared dependency has the format of `\App\ModelName` (with the leading backslash), which causes the fatal exception of; 

> "Fatal error: Cannot declare class App\Base\ModelName because the name is already in use in ..."
reliese/laravel