leap cli: presence of rails 4 gems breaks leap cli build
certificate authority depends on activemodel >= 3.0.6 - if AM 4.0.0.beta1 is present it will use that and fail to requiere active_model when running the leap command.
Similar issue exists if i18n 0.6.4 gem is installed. (rake install fails then)
(from redmine: created on 2013-04-09)