Initial commit

Command line thumbnailer tool for now.
Fix source manager bug in jpeg_read when skipping data
Work around libswscale stupidly checking alignment of 4 planes
Remove debug
Server implementation
Switch to handler registration to make pprof work
Rename package under github.com
Forward upstream HTTP errors
Fix rescaling logic, make it always transcode if needed
Remove unused function
Add check for insane image dimensions
Add README
go fmt
Add LICENSE
goimports