Make jruby binary not segfault if PATH isn't set correctly.
Remove rubygems hacks, since they are no longer necessary now
that the versions of rubygems for the other ruby interpreters
are > 1.3.7.
No longer ship the ri documentation files with JRuby. JRuby
ships with a broken ri binary anyway (requires the rdoc gem to
work), and almost all users of JRuby have MRI ruby installed
and can use its ri binary.
script, so it can now be used in shebang lines. Remove the
building of nailgun, since nailgun support is now part of the
jruby binary.
This requires patching the included jruby-launcher gem to make a
similar change we used to make to the jruby.bash script, to set the
JAVA_HOME environment so things work correctly.
Also, create the SITEARCHDIR directory by default.
OK jcs@
