Add bundle parallel config

Rakefile

@@ -31,6 +31,8 @@ task :install => [:submodule_init, :submodules] do
 
   install_term_theme if RUBY_PLATFORM.downcase.include?("darwin")
 
+  run_bundle_config
+
   success_msg("installed")
 end
 
@@ -117,6 +119,29 @@ def run(cmd)
   `#{cmd}` unless ENV['DEBUG']
 end
 
+def number_of_cores
+  puts "======================================================"
+  puts "Calculating number of cores"
+  puts "======================================================"
+
+  if RUBY_PLATFORM.downcase.include?("darwin")
+    cores = run %{ sysctl -n hw.ncpu }
+  else
+    cores = run %{ nproc }
+  end
+  puts
+  cores.to_i
+end
+
+def run_bundle_config
+  bundler_jobs = number_of_cores - 1
+  puts "======================================================"
+  puts "Configuring Bundlers for parallel gem installation"
+  puts "======================================================"
+  run %{ bundle config --global jobs #{bundler_jobs} }
+  puts
+end
+
 def install_rvm_binstubs
   puts "======================================================"
   puts "Installing RVM Bundler support. Never have to type"