s/EVAL_TOKEN/eval/ and rm supporting script

YUICompressor was unable to minify the json-parse code because it contained
`eval`. So I had to insert a placeholder EVAL_TOKEN which to allow minification,
then use a post-minify script to replace EVAL_TOKEN with `eval`.

This appears not to be necessary any more, and caused a problem with the 3.10.0
CDN deployed files.

@reid @ericf, I don't know what caused the CDN deployed code to have the unreplaced token. The lack of symmetry between the zip bundles and the CDN files is unsettling.

I installed uglify locally and while I honestly don't know if shifter used it or not (or what was previously being used for minification), but after removing the token, leaving `eval` in the code, the min file generated correctly.

I'll wait on your ok to merge this, as I want some assurance that the successful minification wasn't a quirk of my environment or there is something else needing updating.