Make specs green on Travis.

spec/unit/specification_spec.rb

@@ -106,9 +106,14 @@ end
 
 describe "A Pod::Specification that's part of another pod's source" do
   before do
+    config.repos_dir = fixture('spec-repos')
     @spec = Pod::Specification.new
   end
 
+  after do
+    config.repos_dir = SpecHelper.tmp_repos_path
+  end
+
   it "adds a dependency on the other pod's source, but not the library" do
     @spec.part_of = 'monkey', '>= 1'
     @spec.should.be.part_of_other_pod