TextBlocks have #parent not #parent_text, refers to the same though
Merge pull request #1001 from shoes/spans-parent

TextBlocks have #parent not #parent_text 

* fixes #979
* Changelog: improvement
Temporary workaround for travis-ci/travis-ci#3067

* somehow jruby19 went on to use 9k...
Merge branch 'master' into changelog-4.0.0.pre3 (for travis fix)