Added unit test for PascalCasing package names in Ruby.

ruby/Rakefile

diff --git a/ruby/Rakefile b/ruby/Rakefile
index f6354e1..ba1cf4c 100644
--- a/ruby/Rakefile
+++ b/ruby/Rakefile
@@ -80,10 +80,15 @@
 
 # Proto for tests.
 genproto_output << "tests/generated_code.rb"
+genproto_output << "tests/test_import.rb"
 file "tests/generated_code.rb" => "tests/generated_code.proto" do |file_task|
   sh "../src/protoc --ruby_out=. tests/generated_code.proto"
 end
 
+file "tests/test_import.rb" => "tests/test_import.proto" do |file_task|
+  sh "../src/protoc --ruby_out=. tests/test_import.proto"
+end
+
 task :genproto => genproto_output
 
 task :clean do

ruby/tests/generated_code.proto

diff --git a/ruby/tests/generated_code.proto b/ruby/tests/generated_code.proto
index 42d82a6..62fd83e 100644
--- a/ruby/tests/generated_code.proto
+++ b/ruby/tests/generated_code.proto
@@ -1,6 +1,6 @@
 syntax = "proto3";
 
-package A.B.C;
+package a.b.c;
 
 message TestMessage {
   int32 optional_int32 = 1;

ruby/tests/generated_code_test.rb

diff --git a/ruby/tests/generated_code_test.rb b/ruby/tests/generated_code_test.rb
index 26bafdd..b92b046 100644
--- a/ruby/tests/generated_code_test.rb
+++ b/ruby/tests/generated_code_test.rb
@@ -4,6 +4,7 @@
 $LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__)))
 
 require 'generated_code_pb'
+require 'test_import_pb'
 require 'test/unit'
 
 class GeneratedCodeTest < Test::Unit::TestCase
@@ -13,5 +14,6 @@
     # successfully creates message definitions and classes, not to test every
     # aspect of the extension (basic.rb is for that).
     m = A::B::C::TestMessage.new()
+    m2 = FooBar::TestImportedMessage.new()
   end
 end

ruby/tests/test_import.proto

diff --git a/ruby/tests/test_import.proto b/ruby/tests/test_import.proto
new file mode 100644
index 0000000..230484e
--- /dev/null
+++ b/ruby/tests/test_import.proto
@@ -0,0 +1,5 @@
+syntax = "proto3";
+
+package foo_bar;
+
+message TestImportedMessage {}