silence warning if no alien_name
add gitignore
fix for repository paths that are not relative

- changes behaviour of get_file method for
  Alien::Base::ModuleBuild::Repository
- checks if the HTTP link passed to get_file in Repository::HTTP is an
  absolute URI
add tests for building absolute URI from file
Merge branch 'master' of git://github.com/preaction/Alien-Base into preaction-master
Merge pull request #31 from zmughal/fix/http-abs-uri

fix for repository paths that are not relative
tweak comment