Updating _doc/*.json generates noisy diff

[shinnn]

Like 881ca71#diff-f63bc924b61374f1fda1e1caa1070f49

When I build this site all the file properties will be updated, because my machine doesn't have /Users/shakyshane directory (of course).

@shakyShane Should _doc/*.json be included in the repository? Or can we add them to .gitignore?

[shakyShane]

Yeah I think it'd be fine to ignore those files.