JSONP highlight and UglifyJS

[RunDevelopment]

Right now, we use UglifyJS to compress our .js files.

UglifyJS also replaces the names of most function with a new shorter name to decrease file size.
But this is a problem because it changes that function's .name property upon which JSONP Highlight's getAdapter relies.

As a consequence, Prism.plugins.jsonphighlight.removeAdapter("github") will remove the github adapter when using the development version, but it doesn't do anything when using the minified version.

Possible solutions

1. We could set keep_fnames: true in the mangle options of UglifyJS but this will also blow up the file size of (almost) every other file with named functions.
2. Change the definition of registerAdapter to take an optional name, like so:

   function registerAdapter(adapter, name) {
   	name = name || adapter.name;
   	...
   }

   We would have to change the underlying adapter list as well, but that's not a problem because we don't expose it.
3. Change the definition of registerAdapter to require a name similar to Prism.hooks.add.
   This is a breaking change.