Back and forth we go?

Every time I switch from jruby-1_7 branch to master or vice-versa, I have to do a clean build. Unfortunately a clean build replaces the installed jruby launcher (native bin/jruby) with the bash script, while the bin stubs for gems still reference it via a long shebang. This causes those scripts not to work until I re-install jruby-launcher again.

Sigh.