AWS-Resizer with Streams

An AWS Lambda function that duplicates images to different sizes. Using streams, this reduces the buffer overflow when processing files, which typically causes the imagemagick library to complain.

Currently only supports JPG and PNG. Looking to add .gif support in the future.

##Instructions

1. Run npm install (duh!)
2. Modify the SIZES values to choose what files to use
3. Run make lambda to generate an packaged lambda zip file