Make specs green.

lib/cocoapods/config.rb

@@ -46,7 +46,9 @@ module Pod
 
     # Returns the spec at the pat returned from `project_podfile`.
     def rootspec
-      @rootspec ||= Podfile.from_file(project_podfile)
+      @rootspec ||= begin
+        Podfile.from_file(project_podfile) if project_podfile.exist?
+      end
     end
 
     def ios?

spec/unit/config_spec.rb

@@ -32,13 +32,6 @@ describe "Pod::Config" do
       end
     end
 
-    it "returns the path to an existing podspec file if a Podfile doesn't exist" do
-      (temporary_directory + 'Bananas.podspec').open('w') { |f| f << '# Yo' }
-      Dir.chdir(temporary_directory) do
-        config.project_podfile.should == Pathname.pwd + 'Bananas.podspec'
-      end
-    end
-
     it "returns the path to the Pods directory that holds the dependencies" do
       config.project_pods_root.should == Pathname.pwd + 'Pods'
     end