Specify rbx-2 since there is currently an issue with specifying rbx in the travis build environment
Test against ruby 2.1.0 on travis
Account for records with no holdings, a single holding and multiple holdings
Account for records with no itemss, a single item and multiple items
Update the record VCR cassette with for records with  0, 1 and multiple items and holdings
Remove space from curly braces to visually differentiate between Hashes and Blocks
Handle errors gracefully when the Holding API client has an error
Handle errors gracefully when the Item API client has an error
Handle errors gracefully when the Record API client has an error