Working Library functions

 - index.js exposes street.js module logic
 - Real files uploaded and downloaded
 - Correct Hash generated per file
Workable State : Version 0.5

 - Export required function instead of running it
 - Working bin/street command
 - Removed console.log statements
 - Added Debug statements with 'street' prefix
 - Renamed content-hasher to uploadable-collector
 - Added Dry-Run method that doesn't upload anything
Add zlib compression to manifest

 - Compress manifest file when writing to disk
 - Decompress manifest file when downloading from S3
Format debug statements
Replace deflate with gzip

 - Update version to 0.6