Add dependency back on libv8

therubyracer now delegates all lookup for its v8
compilation dependencies to the libv8 gem.

if you pass the --with-system-v8 flag to the libv8
gem on install, try to configure therubyracer upon
compile with the following options.

--with-v8-include, --with-v8-lib and --with-v8-dir

Otherwise, it will configure therubyracer to use
the vendored version of v8.

Gemfile

@@ -7,10 +7,3 @@ gem "rake"
 gem "rspec", "~> 2.0"
 gem "rake-compiler"
 gem 'gem-compiler' unless Object.const_defined?(:RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
-
-group :libv8 do
-  gem 'libv8', "~> 3.11.8"
-end
-
-
-

ext/v8/extconf.rb

@@ -16,10 +16,14 @@ end
 if enable_config('debug')
   $CFLAGS += " -O0 -ggdb3"
 end
-if have_rubygem_libv8?
-  build_with_rubygem_libv8
-else
-  build_with_system_libv8
+
+begin
+require 'libv8'
+rescue LoadError
+require 'rubygems'
+gem 'libv8'
+require 'libv8'
 end
+Libv8.configure_makefile
 
 create_makefile('v8/init')

lib/v8/version.rb

@@ -1,3 +1,3 @@
 module V8
-  VERSION = "0.11.0"
+  VERSION = "0.11.1beta1"
 end

therubyracer.gemspec

@@ -17,4 +17,5 @@ Gem::Specification.new do |gem|
   gem.version       = V8::VERSION
 
   gem.add_dependency 'ref'
+  gem.add_dependency 'libv8', '~> 3.11.8.5'
 end