Adds support for string func names in objs classes

[amadeus]

This fixes #477

Basically this adds support for function definitions like this:

var obj = {
    "some-func"(){},
    'another-func'(){}
};

class Example {
    "some-func"(){},
    'another-func'(){}
};

[amadeus]

This should definitely get merged into develop and into master asap. It's a simple and very important fix.