Increase resumable_threshold from 2 to 8 MB, for perf reasons
Update ls documentation about state cost delta for -L option
Tab completion proof of concept using argcomplete.
Remove unused imports.
Clean up some more unused imports.
Split cloud object completer into separate class.
Specify argparse arguments in a declaritive manner.
Remove remains of non-declarative argument specifiers.
Remove bash-based completion prototype.
Specify completer name.
Fix import style.
Lint fixes.
Lint fixes.
Lint fixes.
Introduce constants for completer types.
Limit metadata to name.
Provide static method to create URL arguments.
Add some basic tests for tab completion.
Remove unnecessary blank line.
Revert submodule version.