Testing with docker
Testing with docker

Refs #1765

Also remove allowed failures in OSX, as long as I was working on the
travis file. Refs #1828

perl6/doc,jonathanstowe/doc,stmuk/doc,perl6/doc,stmuk/doc,perl6/doc,MasterDuke17/doc,dmaestro/doc,jonathanstowe/doc,jonathanstowe/doc,stmuk/doc,dmaestro/doc,MasterDuke17/doc,MasterDuke17/doc,stmuk/doc,tbrowder/doc,jonathanstowe/doc,tbrowder/doc,perl6/doc,tbrowder/doc,jonathanstowe/doc,dmaestro/doc,stmuk/doc,dmaestro/doc,MasterDuke17/doc,perl6/doc,tbrowder/doc,dmaestro/doc