First pass at updating the Travis CI config

See #94
Second pass at Travis CI config updates

See #94
Fix syntax error in .travis.yml

See #94
More syntax fixes in .travis.yml

See #94
Yeah, I'm not a bash guru

See #94
Move Travis CI test code to a separate file

Limit it to PHP 5.2 until we get everything working

See #94
Revert "Move Travis CI test code to a separate file"

This reverts commit 404124a9e1ff453aec58057157ef9ad6e0e10ff5.
Try again with the Travis Config changes

See #94
Another iteration on the Travis config

See #94
Travis CI: I think we're getting close on this

See #94
More tweaks to the Travis CI config

Run PHP 5.3 first, so that the `codesniff` pass will run first. That
way we fail ASAP.

Run the tests for 3.7 Multisite as well.

Don’t run the 3.7 tests on PHP 5.5, it will cause errors because
`$wpdb` doesn’t support `mysqli` until 3.8, and `mysql` is deprecated
in PHP 5.5.

Simplify the tests config for PHP 5.6.

Se #94
pre-3.9 WP versions can run Ajax tests non-MS

But on multisite they fail.

See #93, #94
Oops, wrong unit tests

See #93, #94, 3e9cb6e
Merge branch 'update-travis-config'