Support preset options for the bundled presets

[Jessidhia]

Right now, if, for example, [ [ "es2015", {} ] ] is given to plain babel-standalone in a browser, it causes babel to error out as it Couldn't find preset "es2015" relative to directory ".".

[Daniel15]

Should be straightforward to do, just need to modify the code at https://github.com/Daniel15/babel-standalone/blob/master/src/index.js#L25 to handle the value being an array.

[taion]

This should probably come with bumping the minimum Babel version to 6.13 in package.json.

[Jessidhia]

Wrote #50 to implement this; also added support for passing options to plugins.

The package.json already requests babel-core and babel-preset-es2015 ^6.13.2.

[taion]

Oh, neat, didn't see that package.json got bumped.

[Daniel15]

Yeah I've got a somewhat-automated process for bumping versions in package.json and automatically releasing new builds as long as the unit tests pass. Haven't committed all the code for that yet though. One thing I should do is change the package.json to use exact package versions rather than ranges, as I always want these builds to be repeatable and use the exact same version of Babel.

[Daniel15]

Added in #50, thanks @Kovensky!