Fix bug in jsbuild's --directory option. Paths were relative and --directory gets absoluted, so removing it wasn't working. We now print paths as absolute by default and render as relative if --directory is set.
Fix the file() package interface when multiple file paths are used.
Set version to 3.1.0 in package.json.
Mention Testacular and Testling in the README.
Change instructions for running Testacular tests.