Fixes safari caching problem.

Don't send Content-Encoding or Content-Length when sending null body.
Merge pull request #4 from cpsubrian/safari

Fixes safari caching problem.
bump (v0.4.5)
Copied index.html to index. This will be the file with an 'unknown' mime.
Added two tests. One to check for defaultContentType if it's set and the other to verify content-type is application/octet-stream if default not set.
Refactored tests.
Implemented actual patch for defaultContentType.
Updated README with defaultContentType option. Bumped package version.
Merge branch 'feature/default-mime'
Merge pull request #6 from jprichardson/master

Implemented an option for the default Content-Type
add defaultContentType option to binary
pass default content type to mime.lookup()
undo bump
add cachelicious to bench
test refactor
break tests up
bump (v0.4.6)
remove cachelicious from bench: ridiculous repo size
fix bench-slam and bench-html
update readme