Moved views related to the sidebar to a separate views/feeds/sidebar folder.
Reverted the change to capybara-webkit. The project is back to using Selenium as its javascript driver during Capybara tests. Also bumped Capybara version to 2.1.0 again, as it is the latest and it doesn't seem to have problems with Selenium.

The alternatives tried (capybara-webkit and phantomjs) don't work well and seem to have strange quirks handling javascript and CSS. Right now tweaking tests for them to pass with one of these drivers would be too much work, I will have to live with the inconveniences of Selenium.

Removed explicit dependence on selenium-webdriver from Gemfile. It doesn't seem to be necessary, maybe the capybara gem has selenium embedded, don't know and don't much care as long as acceptance tests work.

Tweaked a few acceptance tests introducing a delay between clicks, to solve a timing problem the tests were having.
Added a brief delay to solver a timing problem in an acceptance test (the test was trying to click on an entry in a dropdown menu before the dropdown had finished the "open" animation).