Added tests for Test::Unit & Capybara

Add test::unit test for Capybara not creating its own driver
Add test::unit test for Capybara adding the correct version string
Add test::unit test for Capybara to use the existing driver
Add RSpec parallelization

Added a Rake task for running tests in parallel, 1 thread per concurrency available on SL.

TestBroker handles the number of tests, the platform brokerage and the concurrency.

Relying on the "worker" facility of parallel_tests to dispatch tests to available Sauce VMs.

Saucerspec runner replaces the rspec runner for parallel_tests.  The runner creates a duplicate test group for each set of environment variables and also attaches variables from the broker for each group.

Config now only returns the first entry of browsers if not running in || tests.

Increased version to 3
Improved gem documentation for || tests
Merge pull request #137 from DylanLacey/master

Parallelize RSpec tests via Rake