RestKit/RestKit — pull request #910 by pH-k (2012-08-30 15:25:24+00:00)
Title: Map array to NSData

I needed to store an array of strings in Core Data, so I tried to map the array to an NSData attribute in my Core Data object graph.
I received the following error: `No strategy for transforming from 'JKArray' to 'NSData'
Hence my three little lines of code.

Allows one to map an array to an NSData attribute.
The NSArray is archived with [NSKeyedArchiver archivedDataWithRootObject:value].
One can retrieve the NSArray with a simple [NSKeyedUnarchiver unarchiveObjectWithData:data].

By the way, thanks for writing RestKit, it really is amazing.