FIX added function exists around env declaration

[bartjuh4]

Some other packages also using the env function and have their own declaration, this will cause a fatal error.

[oscarotero]

Hello.
This pull request includes some changes in the composer.json file like renamed the project and deleted the author :)
Anyway, this is the reason of why this package has the static method Env::init() to include the global function, so this should be fixed simply with this code:

if (!function_exists('env')) {
    Env::init();
}

In some cases including the env() is problematic (some libraries have their own env() function with a different purpose than this one, for example deployer), so you can use Env::get() instead.

[bartjuh4]

I'm sorry for the commits with changes in the composer.json. This was not intented.

[oscarotero]

I know, don't worry 😃
I'm not sure whether is good idea to include the function_exists inside the Env::init() or not. Some alternatives:

//Create a specific function
Env::initIfNotExists();

//Or using an argument to check
Env::init(true);

[oscarotero]

Finally I've included the function_exists checking and Env::init() returns true or false if the function has been registered or not.
Thanks for reporting this.