[Couchdb Wiki] Update of "ViewCollation" by PaulCarey

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The following page has been changed by PaulCarey:
http://wiki.apache.org/couchdb/ViewCollation

The comment on the change is:
Added sorting with dates section

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  }}}
  
  This trick was [http://www.cmlenz.net/blog/2007/10/couchdb-joins.html originally documented] by Christopher Lenz.
+ 
+ === Sorting with Dates ===
+ 
+ It maybe be convenient to store date attributes in a human readable format (i.e. as a String), but still sort by date. This can be done by converting the date to a number in the emit function. For example, given a document with a created_at attribute of 'Wed Jul 23 16:29:21 +0100 2008', the following emit function would sort by date
+ {{{
+ emit(Date.parse(doc.created_at), doc);
+ }}}
+ 
  
  == Collation Specification ==