Merge branch 'refactor-stdin'

- If STDIN is not empty, read indices from first column in each line,
  and only show list with those indices
- Support 'gist', 'gist star', 'gist grep', 'gist tag'
- So right now, you can concate the result for each subcommand:

  # get gists with tag 1 or tag2, and with tag 3
  gist tag tag1 tag2 | gist tag 3

  # grep gists with string1, and only show starred gist
  gist grep string1 | gist star

0 files changed, 0 insertions, 0 deletions