Better order of dependencies

Put more important runtime dependencies at the top and sort
alphabetically.

Author: billhorsman

mail_interceptor.gemspec

@@ -17,9 +17,9 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_runtime_dependency "activesupport"
   spec.add_development_dependency "bundler"
-  spec.add_development_dependency "rake"
   spec.add_development_dependency "minitest"
-  spec.add_runtime_dependency "activesupport"
   spec.add_development_dependency "mocha"
+  spec.add_development_dependency "rake"
 end