Fix two warnings on Ruby 1.8.7. Closes #475.

cocoapods.gemspec

 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/cocoapods', __FILE__)
+$:.unshift File.expand_path('../lib', __FILE__)
+require 'cocoapods'
 
 Gem::Specification.new do |s|
   s.name     = "cocoapods"

spec/unit/local_pod_spec.rb

@@ -358,7 +358,7 @@ describe Pod::LocalPod do
 
     it "doesn't cleans the user files" do
       useless_file = @local_path + 'useless.txt'
-      FileUtils.touch (useless_file)
+      FileUtils.touch(useless_file)
       @pod.root.should == @local_path
       @pod.clean!
       useless_file.exist?.should.be.true