OM fails to escape already escaped single quote

[jcoyne]

formerly HYDRA-824

properties_ds.bio= ["Women's"]

 SyntaxError:
   (eval):1: syntax error, unexpected tIDENTIFIER, expecting ')'
   xml.bio( 'Women\\'s' )
                      ^
   (eval):1: unterminated string meets end of file
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/term_value_operators.rb:146:in `eval'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/term_value_operators.rb:146:in `block (2 levels) in insert_from_template'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/term_value_operators.rb:140:in `each'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/term_value_operators.rb:140:in `block in insert_from_template'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/nokogiri-1.5.3/lib/nokogiri/xml/builder.rb:293:in `initialize'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/nokogiri-1.5.3/lib/nokogiri/xml/builder.rb:254:in `new'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/nokogiri-1.5.3/lib/nokogiri/xml/builder.rb:254:in `with'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/term_value_operators.rb:139:in `insert_from_template'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/term_value_operators.rb:113:in `term_values_append'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/dynamic_node.rb:77:in `block in val='
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/dynamic_node.rb:72:in `each'
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/dynamic_node.rb:72:in `val='
 # /Users/justin/.rvm/gems/ruby-1.9.3-p194@active_fedora_4.0/gems/om-1.6.0/lib/om/xml/document.rb:54:in `method_missing'