Add initial version Rubygems quarry

This tool generates binary packages for ruby gems.
It properly handles versioned dependencies.
Add ability to specify additional directories through package configs
Explicitly remove binaries only if they are specified in gemspec
Remove unused gem extension dir with its *.so files

The files are copied to lib folder anyway.
Avoid redownloading gem files in makepkg
Add sass-3.2 config
Add gpgme gem
Use lib and bin as default require paths

Unfortunately gems 'require_path' fields contains a lot of garbage.
Get rid of it and use bin and lib by default. Any additional path should be added to config.
Add config option for native dependencies
Add gem patching support

If file config.pkg/$gemname.patch is present then it is going to be use for patching
before installing the gem.

Some gems e.g. rmagick require patching.
Add rmagick gem
Create index dir if it does not exist
Add required webgen directory
Allow to use config ledder

If $name-$slot config file is absent then quarry tries to load more generic config and use one.
Add README
Add package signing
rsync repository to pkgbuild.org server
Add tilt gem
Rename repo name to rubygems