Sort use statements.
use autodie.
Use single quotes where no interpolation required.
Document the use of 'simple' in OrePAN2::Index::as_string().
OrePAN2::Index::load() doesn't make use of any arguments.
Document OrePAN2::Index::delete_index().
More fully document and test uses of "simple".
Merge pull request #24 from tokuhirom/oalders/tidy

tidy + make it easier to get "simple" 02packages format