extra script data by multiple group members must be appended, fixes #28
Simplify aggregation of dependency bundle extra

Do the $new_dep->add_data() calls at end once all extra have been aggregated

Strip trailing whitespace

Appending to pull request #29

/cc @lkraav
Aggregate wp_localize_script data. Props @lkraav

Merge branch 'lkraav-issue-28' into develop

Closes #28
Closes #29