RestKit/RestKit — pull request #842 by haemi (2012-07-04 07:38:30+00:00)
Title: improvement to date formatting; according to issue-815

according to issue 815: if the date to be parsed is a numeric-only value, it's treated as timestamp, which may not always be the desired thing to do (e.g. if the value is YYYYmmddHHmm: 201207040937).

Therefore let's first try all dateformatters - if one is successful, take it; otherwise let's treat the NSString as timestamp.