Refine RbPod::Collection#each to return an enumerator when not given a block.
RbPod::Collection#count doesn't take any arguments.
RbPod::Device#capacity should use DBL2NUM, not rb_float_new.
Gemspec doesn't need 'ext' in require_paths.
No need to explicitly bring in pkg-config, as it's built in.
Explicitly state that the gem requires libgpod-1.0.
Bring in Trollop for CLI utility.
Create empty CLI utility.
Update README with basic usage instructions.