Support for JavaScript octal and binary numbers (in ES6)

[apfelbox]

This will add support octal and binary numbers:

var a = 0o01234567;
var b = 0o101;

I also removed a duplicate negative sign for Infinity.

Fixes part of #111

[apfelbox]

You can merge #596 before this one, so I can rebase my PR based on these javascript changes.

[Golmote]

I just merged #596. Let me know when this PR is updated.

[apfelbox]

So, i just rebased and squashed the changes in one commit.

Ready to be merged @Golmote

[Golmote]

Sorry, can you do it again?

[apfelbox]

@Golmote no problem, done.

[loganfranken]

Hey @vkbansal, maybe I'm wrong, but it doesn't look like operators are highlighted as part of numbers with Prism currently:
http://codepen.io/loganfranken/pen/gpxaLe

So it would seem to fall in line that -Infinity shouldn't be highlighted as a number (if the minus operator in -123 isn't highlighted as number, for example).

Totally let me know if I'm missing something, though!

[apfelbox]

@vkbansal @loganfranken even easier than that. If you take a closer look at the braces in the regex, you will see that only Infinity has a negative sign. That is because that whole match already has a negative sign at the beginning – and therefore the one right before Infinity is duplicate.

@loganfranken you are right, the regex matches it, but it isn't included in the token. Because of this it will be highlighted as operator later on.

[loganfranken]

@apfelbox Ahh, thanks for clearing that up!

[vkbansal]

@apfelbox thanks for the clarification :)