fix a few typos
fix regression on mail delete

commit a6577bb64c98dfbe introduced issue #64
Merge pull request #63 from soulshake/master

fix a few typos
Merge pull request #65 from kalou/fix

fix regression on mail delete
Add credit purchase information to README
disk: output kernel version in info command

closes #66

Reported-by: Nicolas Chipaux <chipaux@gandi.net>
Signed-off-by: William Dauchy <william@gandi.net>
Merge pull request #67 from webcracy/readme-credit-fix

Add credit purchase information to README