Merge pull request #9 from holic/master

Case-insensitive file extensions
bump deps
0.1.5
Use stream-based version of image-min
Merge pull request #17 from matthewwithanm/image-min-0.2

Use stream-based version of image-min
rewrite it

#17 didn't actually work
0.2.0
fix travis
Update readme.md
add ulimit note - fixes #10