add prefix arg to quelpa command
when is not if so no else
Merge pull request #54 from quelpa/prefix-upgrade

add prefix arg to quelpa command
add package-initialize to snippet
added note about obsolete packages
Add an URL fetcher
use default file permissions
Implement version handling
Do only single file fetching for now.
Append MELPA timestamp to version
Add patched `package-buffer-info` function.
Use it with `cl-letf`.
cl-letf package-strip-rcs-id
use better temp function name
add functional tests
Fix typo
add hashing function and test
fix typo
use new hash function to get version suffix
use snapshot as version suffix