Adapted README to match most use cases better.

I think for the subtree and the pull --squash matches the use case of most the users better.
Add basic Gemfile
Clean up .gitignore
Update readme.md
Merge commit '3d31e1d82798c224064d65d9ae8d59b249ad322a'
stubs for testing
parse gpg exported armored keys
Merge branch 'gpg-parser' of github.com:elseym/hkpeter into gpg-parser