Description of problem:
I downloaded deltacloud-core to my directory and tried to run tests for './server/'. I ran 'rake tests'

Version-Release number of selected component (if applicable):
0.0.4

How reproducible:
Install gem json version 1.4.6

Steps to Reproduce:
1. cd server/
2. gem install json --version 1.4.6
3. rake tests
  
Actual results:
Tests failed for:

 test_it_responses_to_json(DeltacloudUnitTest::InstancesTest):
JSON::ParserError: 705: unexpected token at '<h1>Internal Server Error</h1>'

Expected results:
No errors.