Support the uninstall command. (release_handler:remove_release/1)

[lrascao]

@soranoba could you please rebase onto master?

[soranoba]

@lrascao It's finished !!

[lrascao]

@soranoba please rebase onto master and re-apply your changes

[soranoba]

rebase and operation check has finished.

skyplace@ubuntu ~/Documents/spam ((c700105...)) 
$ ./tmp/spam/bin/spam upgrade 0.0.2
Release 0.0.2 not found, attempting to unpack releases/0.0.2/spam.tar.gz
Unpacked successfully: "0.0.2"
Installed Release: 0.0.2
Made release permanent: "0.0.2"
skyplace@ubuntu ~/Documents/spam ((c700105...)) 
$ ./tmp/spam/bin/spam versions
Installed versions:
* 0.0.2 permanent
* 0.0.1 old
skyplace@ubuntu ~/Documents/spam ((c700105...)) 
$ ./tmp/spam/bin/spam uninstall 0.0.1
Release 0.0.1 is marked old.
Uninstalled Release: 0.0.1
skyplace@ubuntu ~/Documents/spam ((c700105...)) 
$ ./tmp/spam/bin/spam versions
Installed versions:
* 0.0.2 permanent

[lrascao]

+1

[soranoba]

thanks!

[lrascao]

👍