no sha1 collisions are known, contrast to md5

at the expense of 4 additional bytes in the digest column
Merge pull request #9 from buhman/master

explicit content encoding
Merge pull request #10 from buhman/hash-algorithm

replace md5 with sha1
Added stats page
Updated buhman link for authors
add raw/stream route
use mediumblob instead of text
add raw column, send appropriate mimetype
Merge pull request #12 from buhman/stream

request.stream
Misc index changes