Add Gemfile for compat with rake-compiler-dev-box.

Increase version of rake-compiler to 0.9.1. That is needed for the
x64-mingw32 build.

This also solves github issue #53 .

Author: larskanis

Gemfile

@@ -0,0 +1,15 @@
+# -*- ruby -*-
+
+# DO NOT EDIT THIS FILE. Instead, edit Rakefile, and run `rake bundler:gemfile`.
+
+source "https://rubygems.org/"
+
+
+gem "minitest", "~>5.0", :group => [:development, :test]
+gem "rdoc", "~>4.0", :group => [:development, :test]
+gem "rake-compiler", "~>0.9.1", :group => [:development, :test]
+gem "mini_portile", "~>0.2.2", :group => [:development, :test]
+gem "hoe-bundler", "~>1.0", :group => [:development, :test]
+gem "hoe", "~>3.7", :group => [:development, :test]
+
+# vim: syntax=ruby

tasks/gem.rake

@@ -6,7 +6,7 @@ rescue LoadError
   require 'hoe'
 end
 
-Hoe.plugin :debugging, :doofus, :git, :minitest
+Hoe.plugin :debugging, :doofus, :git, :minitest, :bundler
 
 HOE = Hoe.spec 'sqlite3' do
   developer           'Jamis Buck', '[email protected]'
@@ -23,9 +23,10 @@ HOE = Hoe.spec 'sqlite3' do
   spec_extras[:extensions] = ["ext/sqlite3/extconf.rb"]
   spec_extras[:license] = "MIT"
 
-  extra_dev_deps << ['rake-compiler', "~> 0.8.2"]
+  extra_dev_deps << ['rake-compiler', "~> 0.9.1"]
   extra_dev_deps << ["mini_portile", "~> 0.2.2"]
   extra_dev_deps << ["minitest", "~> 5.0"]
+  extra_dev_deps << ["hoe-bundler", "~> 1.0"]
 
   clean_globs.push('**/test.db')
 end