NEW: Add test suite testing the default recipe using only default attributes.
FIX: By default Jetty 8 is used because the default java version is 1.6.

Fix #1.
FIX: Give jetty.logs=/var/log/jetty by default to java to start Jetty.

Close #2
NEW: Add new test suite default.
FIX: Document recents changes about the attribute ["jetty"]["logs"] and the new default values for ["jetty"]["version/link/checksum"]