Streaming test failure on Ruby 2.0.0

[ashmoran]

Possibly the code still works internally as this is just a mismatched error, but running the RSpec suite on Ruby 2.0.0 produces the following failure:

Failures:

  1) Tripod::Streaming.get_data streaming with a limit should raise an exception if it's bigger than the limit
     Failure/Error: lambda {
       expected Tripod::Errors::SparqlResponseTooLarge, got #<Zlib::BufError: buffer error> with backtrace:
         # ./lib/tripod/streaming.rb:37:in `block in get_data'
         # ./lib/tripod/streaming.rb:28:in `get_data'
         # ./spec/tripod/streaming_spec.rb:59:in `block (6 levels) in <top (required)>'
         # ./spec/tripod/streaming_spec.rb:58:in `block (5 levels) in <top (required)>'
     # ./spec/tripod/streaming_spec.rb:58:in `block (5 levels) in <top (required)>'