+ Install as a Ruby gem.
* Removed install/uninstall tasks. Too buggy. Gems do a better job.
* Added autopopulation of more items.
* Hoe now builds signed gems automatically. Run the generate_key task to
automatically create a signing key.
* Extended rdoc pattern to include ext dirs.
* Fixed dependency adding for versionless dependencies.
* Added NODOT env var to disable RDoc diagram generation.
* The config_hoe task automatically merges in new config entries.
* Added exclude parameter for check_manifest filtering to .hoerc.
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