Configurable options

Hi!
I really like this package, it is a great idea, and came really handy now for me.
I am currently developing a website for an end-user client, and I thought that it could be potentially dangerous to leave the option to delete translations, and modify laravel built-in language strings.
So, I modified the package to make this two options configurable, leaving the current functionality with the defaults.
Please take a look into it. I'm ready to discuss and modify anything about this.