Issue #121 Added DirectoryListing
Issue #121 DefaultHostTest#showsDirectoryListing
Issue #121 Unit test passes
Issue #121 Added Xembly dependency to s3auth-hosts/pom.xml
Issue #121 Addressed code review comments
Merge pull request #124 from carlosmiranda/121_2

#124: pull request Issue #121 Added directory listing capability when specifying ".../index.html"