Fix stat when using -rpm-use-file-permissions:
Strip leading slash from file pathname before call to stat,
otherwise the correct file permissions will not be computed.
Remove default value for the Gem package type's --bin-path flag

This allows the path to be calculated dynamically (and properly)

Also, add staging_path to bin_path
Merge pull request #476 from torrancew/use_gem_env

Remove default value for the Gem package type's --bin-path flag
- don't abort on 1.9 anymore when using cpan
- update changelog
version bump
Merge pull request #464 from justrich/rpm-use-file-permissions

Fix for file stat when using -rpm-use-file-permissions
Update changelog