Worked through search_with_trait_sets_test for #171

Not a problem with rbenv 2.0.0p451 on h14
Fix bad reference to taxa fixture
Use poltergeist instead of selenium

Uses PhantomJS for headless integration testing. PhantomJS is available on Travis

See #171
make poltergeist required for test
Update Gemfile.lock
Set capybara default wait time to 5
Use find to force capybara to wait for javascript
Merge pull request #172 from NESCent/fix-capybara

Integration test for search w/ trait sets