Simple module to manage vendored code.

To vendor a library simply download its whole git repo or untar into vendor/libraryname and create a load_libraryname.rb file to add its libdir into the $:.

Once you have that file, add a require line in vendor/require_vendored.rb which will run after all the load_* files.

The intention is to not change vendored libraries and to eventually make adding them in optional so that distros can simply adjust their packaging to exclude this directory and the various load_xxx.rb scripts if they wish to install these gems as native packages.