RM #2419 added detail on listening to IPV6 interfaces.
Added 3.0 to 3.5.1 upgrade overview based on comments in support ticket#1066
Merge pull request #140 from tzz/tzz/version-clarification

Added 3.0 to 3.5.1 upgrade overview based on comments in support ticket#1066
Merge pull request #138 from neilhwatson/master

RM #2419 added detail on listening to IPV6 interfaces.
Merge pull request #139 from tzz/master

Improve returnszero+execresult docs to mention they are evaluated by cf-promises
Document automatic linking from keywords
Merge remote-tracking branch 'upstream/master'
Update documentation to explain behavior when process_result is empty.

This updates as per fixes made for #3224
Document the need for curl.
Merge pull request #144 from zzamboni/fix/need_curl

Document the need for curl