Update ser.py

Implementing ThreadPoolExecutor approach in uploading images
Merge branch 'live' of github.com:OlegYarosh/pin into live
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Merge branch 'live' of github.com:OlegYarosh/pin into live
Layout changes
configure index.html layout
Merge branch 'live' of github.com:OlegYarosh/pin into live
Merge branch 'live' of github.com:OlegYarosh/pin into live
Merge branch 'live' of github.com:OlegYarosh/pin into live
Update ser.py

Adding missing imports
Update ser.py
Merge branch 'live' of github.com:OlegYarosh/pin into live
Merge branch 'live' of github.com:OlegYarosh/pin into live
Merge branch 'live' of github.com:OlegYarosh/pin into live
Update media.py

Extending function for storing images on S3 using ThreadPoolExecutor.
Merge branch 'live' of github.com:OlegYarosh/pin into live
layout
Update media.py
Merge with layout
Update media.py

New release of media.py