Unsigned max_diff
Less generic name for the struct, smaller size
Don't diffuse over transparent colors
Merge pull request #20 from pornel/unusedfield

Removed unused Gif_Color.a
Fix typo -- though I doubt the typo mattered.
Fixed custom gamma
Merge pull request #21 from pornel/customgamma

Fixed custom gamma
Merge remote-tracking branch 'origin/master'

* origin/master:
  Fixed custom gamma
  Fix typo -- though I doubt the typo mattered.
  Removed unused field from Gif_Colormap
  Avoid garbage return value when (s == 0 || n == 0)
Merge branch 'incremental'

* incremental:
  Per-frame lossy setting
  Avoid typedef redefinition
  Incremental writer
  gfc_deinit()
Reduce amount of tricky pos+1/pos--
Merge branch 'lossy'

* lossy:
  Reduce amount of tricky pos+1/pos--
  Don't diffuse over transparent colors
  Less generic name for the struct, smaller size
  Unsigned max_diff