Moves base Asset class up into top-level geoloader directory.
Reverts to old /abstract structure.
Moves the base asset class into the /assets directory.
Renames the 'Base' loader to just 'Loader' for consistency with the asset classes.
Consolidates loader classes and modules into a single file.
Consolidates asset classes into a single file.
Require 'zip' in the consolidated asset file.
Folds the 'tasks' module into the CLI module.
Updates the test classes to include the relocated Tasks module.
Completely flattens out the directory structure under /lib for simplicity.