Bundler Strategy is broken!

[rylnd]

Steps to reproduce:

1. Add a bundler project with a Gemfile
2. Run rake build_inventory
3. Observe that the contents of the generated .tsv contains only the gems used by oss-inventory, not the gems used by the project:

bundler	1.13.6	MIT
diff-lcs	1.3	MIT, Artistic-2.0, GPL-2.0+
rake	12.0.0	MIT
rspec	3.5.0	MIT
rspec-core	3.5.4	MIT
rspec-expectations	3.5.0	MIT
rspec-mocks	3.5.0	MIT
rspec-support	3.5.0	MIT

4. Shake your head