The bug will manifest itself by failing to locate templates when running tests,
or when running as a daemon (from /).

It relates the the different behavior of ActionView::Template::Path#to_s and
ActionView::Template::Path#to_str when a RAILS_ROOT is defined. #to_s reports
a path relative to the root, and #to_str reports an absolute path.

Signed-off-by: José Valim <jose.valim@gmail.com>