Full Textile support

[Nabav]

Textile documents are not currently supported by Rewrap. By switching the language to plain text (Ctrl + K, M), wrapping is done perfectly, but the syntax highlighting is broken. It would be great to support this markup language.

[stkb]

Starting in pre-release version 17.6 Textile files will be treated as markdown, which should cover most cases but won't be perfect. For full support I will need someone to help by writing the specs. See this comment

[stkb]

The markdown fallback in now also in stable v1.16.2. I'm going to leave this issue open for full Textile support.