BLAC-87 Upgrade rails to 3.2.16
BLAC-83

Refactored the request functionality within the application to take locations into account when asserting that a resource is 'Requestable'. The following has been added to make this possible:-

 - Added #holdings_at(location_prefix) method to HoldingsRecordCollection.  The method will return the HoldingsRecords that exist for a given location based upon the location prefix
 - Refactored LibraryItem requestable? and Available methods to determine whether an item is available at particular location (defined by requestable_locations in blah_config.yml)
 - blah_config.yml now contains a requestable_locations option which enables which locations you want to be requestable - currently defaulting to bjl/kdl