Update project gem description.

Rakefile

@@ -6,7 +6,7 @@ begin
   Jeweler::Tasks.new do |gem|
     gem.name        = "rails-geocoder"
     gem.summary     = %Q{Add geocoding functionality to Rails models.}
-    gem.description = %Q{Add geocoding functionality to Rails models.}
+    gem.description = %Q{Geocoder adds object geocoding and database-agnostic distance calculations to Ruby on Rails. It does not rely on proprietary database functions so finding geocoded objects in a given area is easily done using out-of-the-box MySQL or even SQLite.}
     gem.email       = "alex@alexreisner.com"
     gem.homepage    = "http://github.com/alexreisner/geocoder"
     gem.authors     = ["Alex Reisner"]