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Skip build tests if no docker available.

(There is no docker available for precise, so skip the builds for
precise).

Specify platform with env var, test 32 and 64 bit builds.

* Don't update homebrew

* Don't update homebrew

This was accidentally committed.

* [tst:multibuild] run library_builders in manylinux

* [tst:multibuild] fix

* [tst:multibuild] source linux steps

* [travis] require sudo on linux

* [tst:multlibuild] touch config

* [travis] drop sudo for precise

* [tst:multibuld] cleanup

* [tst:multibuild] check for docker

* [tst:multibuild] fix docker check

* [tst:multibuild] drop docker

* [tst:multibuild] fix command

Functions renamed to match their intent better.