Rails 3.1 gemfile issues

my system running with rails3.1 version, which i am using for 3 months.
But
when i create a new application ,Every time i have to changed the
Gemfile
of that application , that means i have to add this two line

gem ‘execjs’
gem ‘therubyracer’

how to avoid this problem…?

thank you
vishnu

Use app templates: