Ignore dotfiles in a spec set directory.

lib/cocoapods/specification/set.rb

@@ -75,7 +75,10 @@ module Pod
       # Returns Pod::Version instances, for each version directory, sorted from
       # highest version to lowest.
       def versions
-        @pod_dir.children.map { |v| Version.new(v.basename) }.sort.reverse
+        @pod_dir.children.map do |v|
+          basename = v.basename.to_s
+          Version.new(basename) if v.directory? && basename[0,1] != '.'
+        end.compact.sort.reverse
       end
     end
   end

spec/unit/specification/set_spec.rb

@@ -76,4 +76,9 @@ describe "Pod::Specification::Set" do
     @set.required_by(Pod::Spec.new { |s| s.part_of = 'ASIHTTPRequest' })
     @set.should.be.only_part_of_other_pod
   end
+
+  it "ignores dotfiles when getting the version directories" do
+    `touch #{fixture('spec-repos/master/ASIHTTPRequest/.DS_Store')}`
+    lambda { @set.versions }.should.not.raise
+  end
 end