Version 1.1.0 - GIF conversion fix and more

As per #3, GIF conversion will now:

  * Check all frames for 256 color limits
    * Combine all unique colors into a new palette and use that for
      all frames.
    * If not, convert frames to RGBA, as PNG cannot support more than
      256 total colors.

Other minor changes are:

  * Extract
    * --iteratorPadding/-p option to pad output filenames with zeroes if
      needed.
    * --iteratorStart/-i option to change the filename starting index.
    * --iterateDefault option to mark the first frame to be counted as
      part of the file indexing, rather than as "default.png".
    * --output/-o option to specify an explicit output directory to
      extract frames to.
  * Query
    * Print each frame's Image.(type) to stdout.

Version 1.0.0

Seems robust enough for a v1 release.