Add app-text/lit-0.1.0.4.

Lit is a tool for literate programming. Instead of TeX, which is used by
Knuth's WEB system, Markdown is used as the documentation markup
language for lit.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Merge pull request #346 from omasanori/lit

Add app-text/lit-0.1.0.4.