Returns the full path to the base gem directory.
eg: /usr/local/lib/ruby/gems/1.8
Full path of the target library file. If the file is not in this gem, return nil.
Paths in the gem to add to $LOAD_PATH when this gem is activated.
See also require_paths=
If you have an extension you do not need to add "ext" to the require path, the extension build process will copy the extension files into “lib” for you.
The default value is "lib"
Usage:
# If all library files are in the root directory... spec.require_path = '.'
Returns the paths to the source files for use with analysis and documentation tools. These paths are relative to full_gem_path.
Arguments used when building gems