updates debugger

bumps version to latest, updates Gemfile and Gemfile.lock

fixes #55
Merge branch 'Imnudar-update-gem/debugger'
updates capybara and poltergeist

bumps version to latest, updates Gemfile and Gemfile.lock

fixes #57 and #58
updates manage_userstory_spec

changes querying of elements
but still unclear inconsistent behaviour with js
Merge branch 'Imnudar-update-gems/capybara-and-poltergeist'
updates configuration of test suite

reenables DatabaseCleaner
removes shared transaction
removes obsolete clutter

fixes #61
Merge branch 'Imnudar-reconfigure-testsuite'