add contributed comments for android.se

from https://github.com/orac/ProFormaComments at 5a3716118524c126d348d48aed0d7c5da9bdc4b2
add contributed comments for askubuntu.se

from https://github.com/AskUbuntu/ProFormaComments at b026cdab8e789e35104f997762d61b22d5d31d67
add contributed comments for softwarerecs.se

from https://gist.github.com/alerque/362a6aff9d98cb774801 at e2ae2f14360ce7ae4fe8358b92c994211e2e3373 converted to json
add default remote URL with contrib json files

See https://github.com/Benjol/SE-AutoReviewComments/issues/6

This is the simplest possible step towards implementing per site
remotes. The only thing happening here is the current remotes field is
pre-populated with a pre-defined location baset on the current site that
has jsonp files setup. Only works for sites that have contrib entries
already setup.