Change gemspec to not rely on the presence of git and the git reposit…

…ory, making it compatible with specifying the git repository in a Gemfile, bundle package --all and subsequent deployment.

savon.gemspec

@@ -32,6 +32,10 @@ Gem::Specification.new do |s|
   s.add_development_dependency "mocha", "~> 0.11"
   s.add_development_dependency "json",  "~> 1.7"
 
-  s.files = `git ls-files`.split("\n")
+
+  ignores = File.readlines('.gitignore').grep(/\S+/).map {|s| s.chomp }
+  dotfiles = [ '.gitignore', '.rspec', '.travis.yml', '.yardopts' ]
+  s.files = (Dir["**/*"].reject { |f| File.directory?(f) || ignores.any? { |i| File.fnmatch(i, f) } } + dotfiles).sort
+
   s.require_path = "lib"
 end