runes in quick guide and the runes in the mastery and rune page aren't the same.

Quick guide shows scaling AP, and the other page shows scaling MR.

No bloodthirster or BoTRK?

BotRK might work out nicely, probably replacing Wriggles; five procs during his ult is pretty nice, kinda like how Bloodrazor was on him back in the day. I wouldn't bother with BT though unless you're snowballing and spending a lot of time autoattacking things; none of his skills scale off of AD, unless you count Hunter's Call giving him AS (in which case the on-hit from BotRK is still probably better). The fact that his passive also loves AS makes the BotRK a much better choice than BT.

Warwick doesn't scale very well into late-game as a damage dealer, he's only got two damage-dealing skills and one of them is his ult. His late-game is usually best spent itemizing as a tank; Frozen Heart for the aura and CDR, Wit's End adds a bunch of damage onto his ult while still giving defensive stats, etc.
You're trying to maximize killing potential with your mid-game ganks (post-six), then transition into a tank or split-push role, abusing the heal on Q, boosting the team with W and using the ult to initiate and/or lock down the enemy carry. The tankier you can get using only jungle gold, the better.

I'm a tad confused, what use is summoners wrath if you use smite and flash in this build?

Flash+ult is incredibly powerful, but Exhaust gives him some more pressure in early ganks, so it seems likely he'd been using Exhaust when he wrote the masteries and just forgot to change it later. Or who knows, maybe he just copy+pasted the masteries from Dr. Mundo or something.
Obviously, there's no benefit to be gained in Summoner's Wrath if you don't have an offensive summoner spell, so just put the 4th point into Fury (or Butcher).

might wanna consider spirit of lizard, it melts with ur attk speed

The quick guide section got a more complex description on how to build Warwick then the dedicated Item Build section, care to fix this? :)

Not a big deal - but the lore is old.  When I saw it, it made me wonder how up to date the guide was.

Why do you take "Summoner's Wrath" but you don't have "Ignite", "Ghost" or "Exhaust"

Sadly noobs at my ELO can never stay safe till I reach lvl 6. My best time to lvl 6 was around 6:30 btw.

You might need to make alterations to your build/style to fit your ELO, or try to focus on other junglers.
Warwick doesn't exactly have the option of ignoring his lanes and itemizing for late-game, since his strength is all in the mid-game. You might need to delay your own 6 a bit and go for a gank or two; you're unlikely to get kills out of it (though depending on your ELO, your opponents might be just as dumb), but you can probably scare them into wasting summoners or just sending them B. You should probably try to tell your laners ahead of time that you can't get kills before 6, and not to over-commit to ganks before then. Telling them not to push before the 7:00 mark might also help, if they'll listen.
Been a while since I've played Warwick, so I'm not sure what exactly would be the best strategy for an early-game build; you might need to pick up a Giant's Belt before you start on the Wit's End, so you can be a bit more tanky going into ganks (you'll rely more on your teammates for damage, but hopefully you win fights by virtue of being 2v1 and hard-to-kill, yourself). Red buff is also important if you don't have 6.

If they're seriously just that terrible, and you're not having any luck with terrible opponents, I'd just switch it up and go for a jungler who can carry late-game, or has stronger ganks pre-6. Pull out Warwick for solo-top instead.
Dr. Mundo has good ganks as soon as he picks up Q, and doesn't need blue buffs. Shen's still decent in the jungle too (not spectacular), but he can gank early with taunts, and after-6 he can force fights in your favor (if your teammates have a bad habit of starting 1v1 fights they can't win, Shen can fix that). Master Yi has pretty lackluster ganks, since he relies on red buff as his only form of CC, but he can farm so hard in the jungle it almost doesn't matter; by late-game you're going to be a pretty scary splitpusher. And there's plenty of other options too.

On 1st page, you said "Once you have these 6 items", but there are only 5 items ^^ 

And in "Item Build" : do you realy take a second Wit's end for the late game ?

1 potion + 1 ward + Wriggle + Wit's Ends + Giant's Belt :

35 + 75 + 1600 + 2200 + 1000 = 4910 gold... It's not too late for hp ?

Ty for answer ^^

Messing around with the runes I found this setup of marks and quints give you a better stat: 6 AS marks + 3 Hybrid Pen marks + 3 Hybrid Pen quints. This gives you 0.5 extra magic pen. Not exactly a lot, but it is an improvement.