Please remove empty autoload line in composer.json

Please change:

`"autoload": {
        "psr-0": {
            "ObjectStorage_": "lib/",
            "": "lib/"
        }
    }`

to

`"autoload": {
        "psr-0": {
            "ObjectStorage_": "lib/"
        }
    }`

It's causing a lot of problems
