py_mini_racer incompatible with pypy

[Antar1011]

And I'd previously decided to make pypy compatibility a requirement

[Antar1011]

Okay, so the alternative topy_mini_racer or js2py is to actually just use node.

As a POC, create a file called blah.js which has the following contents:

console.log('Hello World')

Then from the terminal, with node installed, you can run

$ node blah.js
Hello World

So how this would work is that one would have python download the js to be scraped, prepend exports={}, append console.log(JSON.stringify(exports.BattlePokedex) (or whatever), and then use os.system to run node and capture the output. I'm willing to bet with some research I can figure out how to get node to run piped input instead of needing to execute a file.

Note that conda can install node just as easily as pip can install py_mini_racer. Of course, conda doesn't work with pypy, but as long as my environment in TravisCI has node, this shouldn't be a problem--I'll just need to specify somewhere that node is needed to run Onix.

[Antar1011]

Fine for now, since we're not worrying about PyPy compatibility

[Antar1011]

Yeah, building py_mini_racer is nontrivial. Integrating with Travis (see: #40) required that we use a special environment (Ubuntu 14.04 rather than the standard 12.04), and then the only environments I've found where it'll build successfully are 3.5 and 2.7.

That's fine for now, since those are the two environments I'm targeting (and I'm not planning on deploying Onix anywhere that's running an Ubuntu older than 14.04), but this is actually a serious hindrance.