Merge pull request #50 from ryansch/capybara-2.1

Capybara 2.1
Bump capybara to 2.1 explicitly because of backward incompatiblity.

Addresses #51.
Require mechanize 2.7.0 or newer
Comment out focus in spec_helper.
Merge pull request #53 from ryansch/capybara-2.1

Capybara 2.1
Bump minor version for capybara 2.1 and mechanize versions.
Add current ruby2.0 to travis spec.

Although not listed on http://labs.infertux.com/rubygems-wof/, we should be moving to current ruby2.0 compatibility.