saiz: add sample_count to box structure

[bradh]

This is useful when the default_sample_info_size is used and there are no entries in the sample_info_size array.

Resolves #390.

[paulhiggs]

Alternatively, in `src/parsing/saiz.js' replace

	var count = stream.readUint32();
	this.sample_info_size = [];
	if (this.default_sample_info_size === 0) {
		for (var i = 0; i < count; i++) {
			this.sample_info_size[i] = stream.readUint8();
		}
	}

with

	this.sample_count = stream.readUint32();
	this.sample_info_size = [];
	if (this.default_sample_info_size === 0) {
		for (var i = 0; i < this.sample_count; i++) {
			this.sample_info_size[i] = stream.readUint8();
		}
	}

[rbouqueau]

Thanks for this. I have no opinion, @DenizUgur or @cconcolato or @jeanlf maybe?

[DenizUgur]

I have no opinion either, although I'd prefer @paulhiggs's version. Looks cleaner.

[bradh]

I'm personally OK with either, just getting one or the other merged would be good.

[DenizUgur]

Could you revise it like that? I can then merge it.

[DenizUgur]

Thanks