bit of refactoring and adding zamioculcas bin

Rakefile

@@ -1,10 +1,11 @@
 require "bundler/gem_tasks"
+require "bundler/setup" # load up our gem environment (incl. local zanzibar)
+require 'rspec/core/rake_task'
+require 'zanzibar/version'
 
-task 'test' do
-  Dir.chdir('test')
-  system("rspec zanzibar_spec.rb")
-end
+RSpec::Core::RakeTask.new(:test)
 
-task 'install_dependencies' do
-  system('bundle install')
+task :install_local do
+  system "rake build"
+  system "gem install ./pkg/zanzibar-#{Zanzibar::VERSION}.gem"
 end