Omit whitespace when generating JSON artefacts

[Alhadis]

I'm not sure why Linguist ships with "pretty"-printed JSON files (shock quotes used, because 2-space indents are NOT pretty). If whitespace is omitted, several megabytes are shaved off the (unpacked) JSON files:

linguist-grammars.tar.gz (unpacked)  12 MBs  => 8.3 MBs
lib/linguist/samples.json            4.3 MBs => 2.7 MBs

These files aren't intended for human consumption, so I've no idea why they're being generated that way on purpose. If somebody does need to browse their contents, reformatting JSON is trivial to do in anything with a JavaScript engine attached:

JSON.stringify(JSON.parse(jsonSourceCode), null, "\t");

// Or if you like to pretend an arbitrarily-long bunch of spaces is a tab:

JSON.stringify(JSON.parse(jsonSourceCode), null, pickHowManySpacesYouLikeSweetheart);

Template removed as it doesn't apply.

[lildude]

I have no idea why either, but the saving is pretty impressive and I know the GitHub.com dev peeps will be happy with this. Thanks.