Use simpler behaviour for setting process name.

Unfortunately, it tends to be truncated. This means that Test::Unit
displays a truncated test suite name, for instance.

bin/snailgun

@@ -66,7 +66,7 @@ when :rails
       ENV['RAILS_ENV'] = env
       load conf
       require File.expand_path(RAILS_ROOT + '/config/environment')
-      require 'test_help' if env == 'test'   # drastic speedup
+      require 'test_help' if env == 'test'   # drastic speedup, although running rake gives spurious empty test suite
       if Rails.configuration.cache_classes
         STDERR.puts <<EOS
 WARNING: Snailgun doesn't work well with `cache_classes`. Strongly recommend

lib/snailgun/server.rb

@@ -73,14 +73,14 @@ def start_ruby(args)
 
       ARGV.replace(args)
       if !e.empty?
-        $0.replace('-e') rescue ($0 = '-e')
+        $0 = '-e'
         e.each { |expr| eval(expr, TOPLEVEL_BINDING) }
       elsif ARGV.empty?
-        $0.replace('-') rescue ($0 = '-e')
+        $0 = '-'
         eval(STDIN.read, TOPLEVEL_BINDING)
       else
         cmd = ARGV.shift
-        $0.replace(cmd) rescue ($0 = cmd)
+        $0 = cmd
         load(cmd)
       end
     end