Roadmap to 0.4.10

[nponeccop]

I'm going to port an in-house project from 0.4.5 and node 0.10 to 0.4.9 and node 8.x (LTS boron) as the latter seems least broken for the dependencies my project has.

So I volunteer to take over maintenance of everyauth from @bnoguchi

My tasks are essentially:

• [ ] bump and/or fix the deps
• [ ] fix incompatibilities
• [ ] integrate fixes from other branches/PRs
• [ ] do as many small/easy fixes as humanly possible

As for fixing individual providers, I'm only interested in getting the big ones working, with my arbitrary definition of "big":

• google
• facebook
• twitter
• linkedin
• vkontakte

Of course I'll accept fixes for extra ones, but I won't test them myself.

[nponeccop]

My branch is https://github.com/bnoguchi/everyauth/compare/master...nponeccop:hotfix-0.4.10

So far:

• the package is installed without deprecation or security audit warnings with node 8.x
• Google example in example/server.js works (as long as you change the credentials in example/conf.js, of course)
• twitter example works too

Fixing Facebook would require an HTTPS server, because Facebook doesn't support non-https redirection URLs anymore. So I'm postponing fixing the Facebook for now, because my own app can't migrate easily to HTTPS, so I'm not motivated enough to fix Facebook as I can't use it myself.

Vkontakte I can't test due to a combination of personal and political reasons, so only LinkedIn remains to be checked.