Support for Processor Order of Operations

[ztnel]

Description

Currently, the processor has a fixed non-configurable order of operations when it comes to applying image processing techniques. This needs to be supported as the order greatly affects the resulting image. All the embedded documents could have an index field to log the order of ops:

{
   "gaussian_blur": {
      "index": 1,
      "kernel_width": 3,
      "kernel_height": 3
   },
   "dialation": {
      "index": 2,
      "kernel_width": 3,
      "kernel_height": 3,
      "iterations": 20
   }, 
   "erosion": {
      "index": 0,
      "kernel_width": 3,
      "kernel_height": 3,
      "iterations": 20
   },
}