A faster bundle install

Don't install the documentation when installing or updating your gems .
Copy paste that configuration in your ~/.gemrc (create it if needed) :

---
:update_sources: true
:benchmark: false
:backtrace: true
:verbose: true
gem: --no-ri --no-rdoc
install: --no-rdoc --no-ri
update:  --no-rdoc --no-ri

Your bundle install will be faster.