Update packaging for upstream/0.9.1

Extend long description.

debian/changelog

-ruby-expression-parser (0.9.0~git.20130319.6e3c797-1) unstable; urgency=low
+ruby-expression-parser (0.9.1-1) unstable; urgency=low
 
   * Initial release (Closes: #703013)
 
- -- Per Andersson <avtobiff@gmail.com>  Tue, 19 Mar 2013 20:44:29 +0100
+ -- Per Andersson <avtobiff@gmail.com>  Wed, 05 Jun 2013 15:37:03 +0200

debian/control

@@ -23,7 +23,9 @@ Depends:
 Suggests:
  ruby-expression-parser-doc
 Description: mathematical expression parser for Ruby
- Implementation of a parser for mathematical expressions.
+ Implementation of a parser for mathematical expressions. Introducing the
+ Parser class which parses raw string input and gives mathematical objects as
+ output.
  .
  Inspired by http://lukaszwrobel.pl/blog/math-parser-part-3-implementation .
 
@@ -36,7 +38,9 @@ Depends:
 Suggests:
  ruby-expression-parser
 Description: mathematical expression parser for Ruby (documentation)
- Implementation of a parser for mathematical expressions.
+ Implementation of a parser for mathematical expressions. Introducing the
+ Parser class which parses raw string input and gives mathematical objects as
+ output.
  .
  Inspired by http://lukaszwrobel.pl/blog/math-parser-part-3-implementation .
  .

debian/ruby-expression-parser-doc.doc-base

@@ -2,7 +2,9 @@ Document: ruby-expression-parser-doc
 Title: Debian ruby-expression-parser Manual
 Author: David Ricciardi
 Abstract: mathematical expression parser for Ruby
- Implementation of a parser for mathematical expressions.
+ Implementation of a parser for mathematical expressions. Introducing the
+ Parser class which parses raw string input and gives mathematical objects as
+ output.
  .
  Inspired by http://lukaszwrobel.pl/blog/math-parser-part-3-implementation .
 Section: Programming/Ruby