Improve "launchy required" error message
Improve "launchy required" error message

* Bundler is near-ubiquitous, so we can assume that people understand
the `gem '...'` syntax.
* Recommend `:require => false`, as Capybara will `require` launchy, so
there's no reason to slow down startup time.

sideci-sample/sideci-sample-capybara,olivierlacan/capybara,shepmaster/capybara,pombredanne/capybara,shepmaster/capybara,y-yagi/capybara,olivierlacan/capybara,gonzedge/capybara,tjouan/capybara,tjgrathwell/capybara,DariaKalynovska/capybara,randoum/capybara,shepmaster/capybara,pombredanne/capybara,ngpestelos/capybara,DariaKalynovska/capybara,mohanraj1311/capybara,ksmaheshkumar/capybara,jarib/capybara,khaidpham/capybara,jillianrosile/capybara,soutaro/capybara,mohanraj1311/capybara,ngpestelos/capybara,Bartuz/capybara,benlovell/capybara,randoum/capybara,y-yagi/capybara,mlarraz/capybara,irfanah/capybara,mlarraz/capybara,Bartuz/capybara,soutaro/capybara,y-yagi/capybara,ducthanh/capybara,khaidpham/capybara,ducthanh/capybara,wenbofantasy/capybara,jnicklas/capybara,gonzedge/capybara,ngpestelos/capybara,wenbofantasy/capybara,randoum/capybara,teamcapybara/capybara,gonzedge/capybara,benlovell/capybara,olivierlacan/capybara,twalpole/capybara,tjouan/capybara,mreinsch/capybara,tjgrathwell/capybara,teamcapybara/capybara,DariaKalynovska/capybara,jnicklas/capybara,sideci-sample/sideci-sample-capybara,ducthanh/capybara,tjgrathwell/capybara,jarib/capybara,ksmaheshkumar/capybara,soutaro/capybara,tjouan/capybara,jillianrosile/capybara,khaidpham/capybara,Bartuz/capybara,twalpole/capybara,pombredanne/capybara,teamcapybara/capybara,mlarraz/capybara,jillianrosile/capybara,mreinsch/capybara,ksmaheshkumar/capybara,irfanah/capybara,mohanraj1311/capybara,twalpole/capybara,jnicklas/capybara,irfanah/capybara