Ruby 1.9 compatibility

* Add current directory to path for tests because 1.9 does not
* Explicity open file in binary mode to get around encoding issues

Rakefile

@@ -47,7 +47,7 @@ task :default => :test
 
 require 'rake/testtask'
 Rake::TestTask.new(:test) do |test|
-  test.libs << 'lib' << 'test'
+  test.libs << 'lib' << 'test' << '.'
   test.pattern = 'test/**/test_*.rb'
   test.verbose = true
 end

lib/grit/git-ruby/internal/loose.rb

@@ -29,7 +29,7 @@ module Grit
           begin
             return nil unless sha1[0...2] && sha1[2..39]
             path = @directory + '/' + sha1[0...2] + '/' + sha1[2..39]
-            get_raw_object(File.read(path))
+            get_raw_object(open(path, 'rb') { |f| f.read })
           rescue Errno::ENOENT
             nil
           end