bump to capybara master
implement #find_xpath
implement find_css
Don't wait for frame indefinitely

This needs a better fix in Capybara, see
https://github.com/jnicklas/capybara/issues/984#issuecomment-14347198
Implement all_text and visible_text
implement Node#disabled?
Implement #hover
fix spec
delete obsolete spec
make within_frame handle capybara nodes
fix popFrame
add capybara 2.1 support to changelog