Adding support to run a grant on a remote host

[lieutdan13]

This fixes #43

[lieutdan13]

The Travis failure doesn't seem to be related to the changes made.

[alvagante]

Cool.
This would be greatly useful also on the mysql::query and mysql::queryfile defines.

Trying to fix the spec tests on Travis in the meantime

[lieutdan13]

I actually looked at those this morning and it looks like they are already implemented. They just use different variable names. Correct me if I'm wrong...

[alvagante]

Oops, you're right.
Too bad that the parameters names are quite confusing and the same parameter, like mysql_host means different things on query and grant :-I
My fault, made times ago...