Update ser.py

Implementing ThreadPoolExecutor approach in uploading images
Update ser.py

Adding missing imports
Update ser.py
Update media.py

Extending function for storing images on S3 using ThreadPoolExecutor.
Update media.py
Update media.py

New release of media.py
Update media.py

Update comments of store_image_from_filename function.
Update media.py

Comment update media.py
Update ser.py
Update ser.py

Revert changes of ser.py
Revert ser.py
Revert "Revert ser.py"

This reverts commit 46ce6c69b38c1c6c8b15438a30be13a79c9bfe05.
Revert ser.py
Merge branch 'live' of https://github.com/mygetlist/pin into live

Conflicts:
	mypinnings/media.py
Media.py commit
Merge pull request #90 from GarciaPL/live

Upload media to S3 using ThreadPoolExecutor