Update Debian packaging 0.6.0
Merge pull request #214 from duggan/deb-version-bump

Update Debian packaging 0.6.0
command/agent: don't show errors on Windows socket EOF
website: Fixing typo
agent: Don't hold lock while invoking handlers
serf: Fix conflict response decoding
Fix agent help spacing
Add -iface option to agent help.
agent: Document the -rejoin CLI flag