Dedupe string literals in `index.js` files

[mathiasbynens]

Files that would benefit from minification of repeated string values (https://github.com/hzoo/babel-plugin-dedupe-string-literals):

• bidi-brackets/index.js (limited number of entries, but lots of repeated strings)
• categories/index.js (one entry for every code point from U+000000 to U+10FFFF)
• bidi-classes/index.js (almost one entry for every code point from U+000000 to U+10FFFF)

categories/index.js and bidi-classes/index.js are very large and take too long to be processed at the moment. Once hzoo/babel-plugin-dedupe-string-literals#5 is fixed, they can be optimized as well.

[mathiasbynens]

Fixed by using gzipInline.