Even simpler text display plugin

I modified the form_text_display plugin, so I could display text without
having a title, nor a button. The form is rendered only, so users simply
add whatever response collecting item they wish to use after the
text_render item.
Bump version and codename
Merge remote-tracking branch 'jakupmichaelsen/master' into gibson
Merge branch 'playground' into gibson
Merge branch 'playground' into gibson
Improved parameter type checking for forms
Always print stacktrace on exception
Change version