prevent error when recursively copying self via `:path => '..'`
consider `environment.install_path` instead of using hardcoded install dir
Fix for JRuby compatibilty

JRuby doesn't set $? until after the Open3.popen3 block has finished.
Moving the error checking logic outside fixes this problem.
Whitespace.
Track jruby failures in CI.
Update fakefs to a release.
Start testing on ruby-2.0.
Merge branch 'fix_recursive_copy' of https://github.com/tknerr/librarian
Test on ruby-2.0.0-rc1 too.
Test on MRI 2 RC 2.