Implement global Infinity property

[HalidOdat]

ECMASCript feature

Infinity is not a number, but a global property.

We can add this by adding a new module like NaN https://github.com/boa-dev/boa/tree/master/boa/src/builtins/nan and then adding it to the builtin init function in builtins/mod.rs the value it should contain should be Value::from(f64::INFINITY)

More information
- ECMAScript reference
- MDN

[AnirudhKonduru]

@HalidOdat Can I take this up along with #481 ?

[HalidOdat]

@HalidOdat Can I take this up along with #481 ?

You can have this, I'm not sure about the second though, I think @croraf is doing it. If you need any help or have a question tell us :)

[AnirudhKonduru]

@HalidOdat Can I take this up along with #481 ?

You can have this, I'm not sure about the second though, I think @croraf is doing it. If you need any help or have a question tell us :)

Oh ok, thanks! In that case I'll leave out the changes meant of #481 for the time-being