Add test scaffolding

[bryjbrown]

This PR adds:

• PHPUnit scaffolding (phpunit.xml.dist file and /test/bootstrap.php, enough to get the PHPUnit CLI test runner to execute with 0 tests)
• Codecov.io integration (.travis.yml after_success hook and README badge)

This is a stab towards resolving #260 and #280.

[ruebot]

@DiegoPino @whikloj y'all good with me merging this? That way we can start getting codecov feedback.

[ruebot]

sets up PDX for codecov

[ruebot]

@bryjbrown you'll want to add something along these lines to the .travis.yml

[whikloj]

We can merge this, but I'd say wait and see if @bryjbrown has time to write a test or two. No need to rush on it in this state. Codecov would just tell us what we already know 0% covered 😊

[whikloj]

@bryjbrown if you can add those PHPUnit lines that @ruebot pointed to here. We can merge this.

[bryjbrown]

@whikloj @ruebot
I deleted the bryjbrown/pdx repo this PR was made from when I forked br2490/pdx to start working on it. Now I'm not sure what to do.

Gitlords, is there any way I can clone a copy of the original repo from this PR, or should I re-fork/add in the changes from this PR/submit a new PR? I figure there must be a way to have one local repo that can make branches from multiple "origins" (remotes?), but this is definitely a step up in complexity.

[ruebot]

@bryjbrown ouch. you didn't need to do that 😢 -- next time you should be able to pull it off with git remotes, and branching. If you need a hand with that, more than happy to help.

@whikloj want to just merge this, and I can come back through and take care of addressing my comments.

[ruebot]

@bryjbrown ...do you still have a copy of this branch locally? Or did you delete that too?

[bryjbrown]

@ruebot I do! Anything I can do with that?

[ruebot]

@bryjbrown do you remember the branch name you used to make this PR? hopes it wasn't master

[bryjbrown]

This PR is superceded by #10