Import ruby18-textpow-0.10.1 as textproc/ruby-textpow.

Import ruby18-textpow-0.10.1 as textproc/ruby-textpow.

Textpow is a library to parse and process Textmate bundles. Although created
created for their use in a word processor, these bundles have many other uses.
For example, we have used them to create a syntax highligting utility and also
the markup rendering engine used to render this documentation.