Fixed SETARGV_OBJ for VS2013
Fixed some issues when compiling with VS2013
Added lossy GIF code from pornel's fork
Formatting
Added --lossy option
Comments
Fixed off-by-one error found by Nico
Another off-by-one error
Merge v1.82

* master:
  Add a test to catch that.
  To 1.82.
  Another fix to mix resize reported by Bryan Stillwell.
  To 1.81.
  Correct off-by-one in 'mix' resize method.