Merge pull request #122 from DylanLacey/master

Correct Issue #120
Merge pull request #124 from DylanLacey/master

Correcting requiring for Capybara and Cucumber with new driver_pool
Merge pull request #127 from DylanLacey/master

Merge rspec tagging, opera proxying et al
Merge pull request #128 from DylanLacey/master

Tag pull
Fixed stack overflow when calling current_url
Added 'render' method for capybara-screenshots