Move ruby files under src to lib.

Be more consistent with ruby projects: move all ruby files under src to
the lib directory.
Rename URL test and clean up.

Replace initial URL test. Rename the test file to conform to Rake glob
for tests.
Add module for JobUp.

First attempt at module entry point for JobUp. Version 0.0.1.
Add base class for pages returned from opening a URL.
Remove autofilled datestamp.