Orders all artifacts included in the site feature alphabetically.

Having artifacts in arbitrary order makes it difficult to track
changes over time. This change only reorders the artifacts. No
other changes were made.
Moves all tests to junit4
Adds puppet runtime definitions as resources on classpath.

Apparently, the junit runner is not able to find the resources
unless they are included in the Eclipse container in the
.classpath file. This commit adds the needed entry.