Merge pull request airbrake#80 from yanowitz/patch-1

remove git dependency from generating gemspec file.  causes errors when ...

airbrake.gemspec

@@ -8,9 +8,9 @@ Gem::Specification.new do |s|
   s.summary     = %q{Send your application errors to our hosted service and reclaim your inbox.}
 
   s.require_paths = ["lib"]
-  s.files         = `git ls-files`.split("\n")
-  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
-
+  s.files         = Dir.glob("{features,generators,lib,rails,resources,script,test}/*") + Dir.glob("*.md") + %w(CHANGELOG Gemfile Guardfile INSTALL MIT-LICENSE Rakefile SUPPORT_RAILS_VERSION install.rb)
+  s.test_files    = Dir.glob("{test,spec,features}/**/*")
+  
   s.add_runtime_dependency("builder")
   s.add_runtime_dependency("activesupport")