Advance version number to 0.1.7
Correct extract modification times for resources inside JAR files

Fixes #5
Add find-asset-uri (returns nil if not found)
Update some comments
Break asset pipeline initialization into smaller pieces
Fix typo
Fix a bug in find-asset-uri
Add an optional Ring middleware: wrap-with-asset-redirector that sends 302 redirects for assets
Don't attempt to redirect from the "/" URI
Break out some of the rediret code into a private function
Improve documentation
Describe "direct asset URLs"