Add encoding header to the helpers definition file
Add encoding header to the helpers definition file

Fixes "incompatible character encoding" error when running Capybara
on JRuby platforms.

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