admin level index page
update selenium-webdriver
restrict management of level to admin user
fix user ability spec
add Simulator
create action
create level ability spec
remove nested row for level form
begin with level proxy
setup bundler in main class started in subprocess
Merge branch 'master' into admin-level
add Admin subnavigation
start, build, run, stop and remove levels
enable js for level spec
add notices to state changes
submit once and spinner icon
render alert when removing level
use celluloid 0.13
refactor level ability spec
refactor user ability spec