get better pattern matching for uri-like path for jirb

if the path to jruby-complete.jar contains a space the various
uri-like path strings do not match (file: or no protocol, ' ' or '%20')
should be treated equaly.

Sponsored by Lookout Inc.

bin/jirb

@@ -9,7 +9,7 @@
 
 require "irb"
 
-if __FILE__.sub(/file:/, '') == $0.sub(/file:/, '')
+if __FILE__.sub(/file:/, '').gsub(/ /,'%20') == $0.gsub(/file:/, '').gsub(/ /,'%20')
   IRB.start(__FILE__)
 else
   # check -e option