Installation instructions: explicitly use jruby -S when installing buildr gem.
Installation instructions: explicitly use jruby -S when installing buildr gem.


git-svn-id: f481de8ecb0d1e2ade8c586a5c716a32a1f3e8c1@654523 13f79535-47bb-0310-9956-ffa450edef68

atoulme/buildr,liamchristopher/buildr,liamchristopher/buildr,mariusk/buildr-kawa,assaf/buildr,apache/buildr,stewi2/buildr,mariusk/buildr-kawa,liamchristopher/buildr,apache/buildr,stewi2/buildr,assaf/buildr,apache/buildr,jpcaruana/buildr,apache/buildr,stewi2/buildr,atoulme/buildr,jpcaruana/buildr,assaf/buildr,jpcaruana/buildr,jpcaruana/buildr,ittayd/buildr,stewi2/buildr,liamchristopher/buildr,ittayd/buildr,atoulme/buildr,mariusk/buildr-kawa,ittayd/buildr