diff --git a/Gemfile b/Gemfile
deleted file mode 100644
index e1289c8..0000000
--- a/Gemfile
+++ /dev/null
@@ -1,14 +0,0 @@
-source "http://rubygems.org"
-# Add dependencies required to use your gem here.
-# Example:
-#   gem "activesupport", ">= 2.3.5"
-
-# Add dependencies to develop your gem here.
-# Include everything needed to run rake, tests, features, etc.
-group :development do
-  gem "shoulda", ">= 0"
-  gem "bundler", "~> 1.0.0"
-  gem "jeweler", "~> 1.6.4"
-  gem "rcov", ">= 0"
-  gem "rdoc", ">= 0"
-end
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 045cf03..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,24 +0,0 @@
-GEM
-  remote: http://rubygems.org/
-  specs:
-    git (1.2.5)
-    jeweler (1.6.4)
-      bundler (~> 1.0)
-      git (>= 1.2.5)
-      rake
-    json (1.6.3)
-    rake (0.9.2.2)
-    rcov (0.9.11)
-    rdoc (3.11)
-      json (~> 1.4)
-    shoulda (2.11.3)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  bundler (~> 1.0.0)
-  jeweler (~> 1.6.4)
-  rcov
-  rdoc
-  shoulda
diff --git a/Rakefile b/Rakefile
index 5019fbc..e006a65 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,53 +1,24 @@
-# encoding: utf-8
-
-require 'rubygems'
-require 'bundler'
-begin
-  Bundler.setup(:default, :development)
-rescue Bundler::BundlerError => e
-  $stderr.puts e.message
-  $stderr.puts "Run `bundle install` to install missing gems"
-  exit e.status_code
-end
-require 'rake'
-
-require 'jeweler'
-Jeweler::Tasks.new do |gem|
-  # gem is a Gem::Specification... see http://docs.rubygems.org/read/chapter/20 for more options
-  gem.name = "range_math"
-  gem.homepage = "http://github.com/muflax/range_math"
-  gem.license = "MIT"
-  gem.summary = %Q{do math on ranges}
-  gem.description = %Q{use ranges in math expression}
-  gem.email = "mail@muflax.com"
-  gem.authors = ["muflax"]
-  # dependencies defined in Gemfile
-end
-Jeweler::RubygemsDotOrgTasks.new
-
-require 'rake/testtask'
-Rake::TestTask.new(:test) do |test|
-  test.libs << 'lib' << 'test'
-  test.pattern = 'test/**/test_*.rb'
-  test.verbose = true
+desc "open an irb session preloaded with this library"
+task :console do
+  sh "irb -Ilib -rrange_math"
 end
 
-require 'rcov/rcovtask'
-Rcov::RcovTask.new do |test|
-  test.libs << 'test'
-  test.pattern = 'test/**/test_*.rb'
-  test.verbose = true
-  test.rcov_opts << '--exclude "gems/*"'
+desc "build a gem from the gemspec"
+task :build do
+  sh "mkdir -p pkg"
+  sh "gem build range_math.gemspec"
+  sh "mv range_math-*.gem pkg/"
 end
 
-task :default => :test
-
-require 'rdoc/task'
-RDoc::Task.new do |rdoc|
-  version = File.exist?('VERSION') ? File.read('VERSION') : ""
-
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title = "range_math #{version}"
-  rdoc.rdoc_files.include('README*')
-  rdoc.rdoc_files.include('lib/**/*.rb')
+desc "clean pkg"
+task :clean do
+  sh "rm -f pkg/*"
 end
+
+
+desc "install a gem"
+task :install => [:clean, :build] do
+  sh "gem install --no-format-executable pkg/range_math-*.gem"
+end
+
+task :default => :install
diff --git a/VERSION b/VERSION
deleted file mode 100644
index 341cf11..0000000
--- a/VERSION
+++ /dev/null
@@ -1 +0,0 @@
-0.2.0
\ No newline at end of file
diff --git a/range_math.gemspec b/range_math.gemspec
index 4b2fb77..1a861f5 100644
--- a/range_math.gemspec
+++ b/range_math.gemspec
@@ -1,62 +1,17 @@
-# Generated by jeweler
-# DO NOT EDIT THIS FILE DIRECTLY
-# Instead, edit Jeweler::Tasks in Rakefile, and run 'rake gemspec'
-# -*- encoding: utf-8 -*-
-
 Gem::Specification.new do |s|
   s.name = "range_math"
-  s.version = "0.2.0"
+  s.version = "0.3.0"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["muflax"]
-  s.date = "2011-12-04"
   s.description = "use ranges in math expression"
   s.email = "mail@muflax.com"
   s.extra_rdoc_files = [
-    "LICENSE.txt",
     "README"
   ]
-  s.files = [
-    ".document",
-    "Gemfile",
-    "Gemfile.lock",
-    "LICENSE.txt",
-    "README",
-    "Rakefile",
-    "VERSION",
-    "lib/range_math.rb",
-    "range_math.gemspec",
-    "test/helper.rb",
-    "test/test_range_math.rb"
-  ]
+  s.files = `git ls-files`.split("\n")
   s.homepage = "http://github.com/muflax/range_math"
-  s.licenses = ["MIT"]
   s.require_paths = ["lib"]
-  s.rubygems_version = "1.8.11"
   s.summary = "do math on ranges"
-
-  if s.respond_to? :specification_version then
-    s.specification_version = 3
-
-    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_development_dependency(%q<shoulda>, [">= 0"])
-      s.add_development_dependency(%q<bundler>, ["~> 1.0.0"])
-      s.add_development_dependency(%q<jeweler>, ["~> 1.6.4"])
-      s.add_development_dependency(%q<rcov>, [">= 0"])
-      s.add_development_dependency(%q<rdoc>, [">= 0"])
-    else
-      s.add_dependency(%q<shoulda>, [">= 0"])
-      s.add_dependency(%q<bundler>, ["~> 1.0.0"])
-      s.add_dependency(%q<jeweler>, ["~> 1.6.4"])
-      s.add_dependency(%q<rcov>, [">= 0"])
-      s.add_dependency(%q<rdoc>, [">= 0"])
-    end
-  else
-    s.add_dependency(%q<shoulda>, [">= 0"])
-    s.add_dependency(%q<bundler>, ["~> 1.0.0"])
-    s.add_dependency(%q<jeweler>, ["~> 1.6.4"])
-    s.add_dependency(%q<rcov>, [">= 0"])
-    s.add_dependency(%q<rdoc>, [">= 0"])
-  end
 end