fix for no method 'setAttribute' for arguments (org.jruby.RubySymbol,org...

Getting the error:

    $ redstorm install                                                                                         
    #<Class:0x3b66f7>: no method 'setAttribute' for arguments (org.jruby.RubySymbol,org.jruby.RubyString) on Java::OrgApacheToolsAnt::RuntimeConfigurable
      available overloads:
        (java.lang.String,java.lang.String)
        (java.lang.String,java.lang.Object)

on both JRuby 1.7.2 and 1.6.8 with --1.9 mode when running 

    redshift install