Added vec_to_img how_to

Added how_to showing how to convert sarray of dtype array.array to
sarray of dtype image.
Added vec_to_img how_to

Added how_to showing how to convert sarray of dtype array.array to
sarray of dtype image.
Merge branch 'array_to_image' of https://github.com/graphlab-code/how-to into array_to_image

Conflicts:
	array_to_image.py
Added vec_to_img how_to

Added how_to showing how to convert sarray of dtype array.array to
sarray of dtype image.
Added vec_to_img how_to

Added how_to showing how to convert sarray of dtype array.array to
sarray of dtype image.
Added how-to links to readme
Merge branch 'array_to_image' of https://github.com/graphlab-code/how-to into array_to_image
Removed whitespace
Merge pull request #12 from graphlab-code/array_to_image

SArray of array.array to SArray of Images conversion