use get_input_id method for wp_editor to fix issue with WP3.9's requirement 'TinyMCE editor IDs cannot have brackets.' ref #11
added comments explaining changes for 3.9
the long winded comment in Voce_Meta_Field::update_field() is unnecessary, trimmed it down
Merge pull request #11 from voceconnect/wordpress-3.9-fix

3.9 & TinyMCE Compatibility