em_mysql2 should turn on strict mode

[dgutov]

mysql2 does that by default since Rails 4.0: rails/rails#6069

[igrigorik]

@dgutov sounds reasonable. willing to put together a quick pull? :)

[dgutov]

@igrigorik I might (though it wouldn't be quick), but it seems #190 takes care of that problem as well.

[igrigorik]

Ah, fair enough. Should we close this and track it there then?

p.s. thanks for your work on AR driver!

[dgutov]

I'd rather we keep this open: that pull request is primarily about a different issue, and there's no guarantee that it'll be good to merge in the foreseeable future.

No problem, but I've only touched the tests. :)