Cleaned up and added missing required field to gemspec.

unit.gemspec

@@ -4,19 +4,19 @@ require File.dirname(__FILE__) + '/lib/unit/version'
 Gem::Specification.new do |s|
   s.name = %q{unit}
   s.version = Unit::VERSION
+  s.platform = Gem::Platform::RUBY
+  s.summary = 'Scientific unit support for ruby for calculations'
+  s.homepage = %q{http://github.com/minad/unit}
 
-  s.authors = ["Daniel Mendler"]
+  s.authors = ["Daniel Mendler", "Chris Cashwell"]
   s.date  = Date.today.to_s
   s.email = ["mail@daniel-mendler.de"]
 
-  s.files         = `git ls-files`.split("\n")
-  s.require_paths = %w(lib)
-
+  s.rubyforge_project = s.name
   s.has_rdoc = true
+
+  s.files         = `git ls-files`.split("\n")
   s.require_paths = ["lib"]
-  s.rubyforge_project = s.name
-  s.summary = 'Scientific unit support for ruby for calculations'
-  s.homepage = %q{http://github.com/minad/unit}
 
   s.add_development_dependency('rake', ['>= 0.8.7'])
   s.add_development_dependency('rspec')