Combine dependencies of all targets, regardless of platform.

TODO

-* The user *has* to specify the platform of the project in the Podfile.
+* Resolve all dependencies together and write out all dependencies to Podfile.lock together.
+* Add integration spec with multiple platforms.
+* Validate platforms for each target definition.
+* Validate that there are dependencies in a Podfile.
+* Validate that the dependencies in the targets don't conflict. E.g. two different versions of the same pod.

lib/cocoapods/podfile.rb

@@ -305,7 +305,7 @@ module Pod
     attr_reader :target_definitions
 
     def dependencies
-      @target_definitions.values.map(&:target_dependencies).flatten
+      @target_definitions.values.map(&:target_dependencies).flatten.uniq
     end
 
     def dependency_by_top_level_spec_name(name)

spec/unit/podfile_spec.rb

@@ -97,7 +97,7 @@ describe "Pod::Podfile" do
       end
     end
 
-    xit "returns all dependencies of all targets combined, which is used during resolving to ensure compatible dependencies" do
+    it "returns all dependencies of all targets combined, which is used during resolving to ensure compatible dependencies" do
       @podfile.dependencies.map(&:name).sort.should == %w{ ASIHTTPRequest JSONKit Reachability SSZipArchive }
     end