Merge branch 'release/2.3.1' into develop
Use correct mode names

To match adhearsion/adhearsion-asr#14
[BUGFIX] String nodes should take non-strings
Test on proper Rubies in CI
[BUGFIX] Cleanly handle NLSML with no input tag

Fixes #23
[BUGFIX] Drawing an NLSML doc should return something structured/parsed

Fixes #22
[BUG] Cloning an SSML document turns it into GRXML
Merge pull request #27 from sfgeorge/bug/ssml-clone

[BUG] Cloning an SSML document turns it into GRXML
[CS] We don't care about line length
[BUGFIX] allow cloned GenericElement to respect its own class

Fixes bug where SSML documents get converted to GRXML documents

Files affected: lib/ruby_speech/generic_element.rb
Merge pull request #28 from Jared-Prime/feature/fix_ssml_cloning

[BUGFIX] allow cloned GenericElement to respect its own class
[DOC] Changelog entry
[UPDATE] Bump to 2.3.2
Merge branch 'release/2.3.2'