Explicitly state which files to edit

Some people may get confused with the similarity between the two (possibly, want to avoid it either way)
Updated to reflect changes
Merge remote-tracking branch 'upstream/master'
Added wheezy-backports to sources
Specify more explicitly the 10periodic instruction
Added quit; to end of mysql commands ready for next section
Another quit;
Added warnings so they don't panic
More clarifying
Easier to just replace the whole config file. We were kinda doing it anyway
Closed some braces that weren't closed
Added recursive option that was necessary for roundcube
Added libicu version help note
In some cases, listen.owner etc aren't commented
Service was missing number in restart command
Added instructions for removal with self-signed cert + nginx conf
Merge pull request #7 from stevesbrain/master

Cleaning up the language - Thanks gnarlywalrus