Log Message:
Add ruby-mustermann19, required by new ruby-padrino-core package.

Welcome to Mustermann.  Mustermann is your personal string matching expert.
As an expert in the field of strings and patterns, Mustermann keeps its
runtime dependencies to a minimum and is fully covered with specs and
documentation.

Given a string pattern, Mustermann will turn it into an object that behaves
like a regular expression and has comparable performance characteristics.