Additions in event-listener.ly (issue 152600043 by pkx1...@gmail.com)

Greetings Philippe and James, this looks good overall, I just have one minor comment. https://codereview.appspot.com/152600043/diff/1/ly/event-listener.ly File ly/event-listener.ly (right): https://codereview.appspot.com/152600043/diff/1/ly/event-listener.ly#newcode129 ly/event-listener.ly:129:

non-existent procedure-with-setter in input/regression/scheme-text-spanner.ly (issue 157100043 by david.nales...@gmail.com)

Reviewers: , Message: Please review. Description: No procedure-with-setter is provided for ly:spanner-set-bound! in scm/music-functions.scm. This patch removes the faulty usage in input/regression/scheme-text-spanner.ly. Please review this at https://codereview.appspot.com/157100043/ Affecte