4754: add rails-perftest and ruby-prof gems to enable performance benchmarking and add search_test.rb
4754: search_test assertions
4754: move search test into browsing_test.rb instead of having its own file.
Merge branch 'master' into 4754-performance-benchmarks
4754: support RAILS_ENV=performance
4754: update assertion to look for a data-object-uuid
4754: add command to be used to run diagnostics testing as a comment.
Merge branch 'master' into 4754-performance-benchmarks
refs #4754
Merge branch '4754-performance-benchmarks'