travisproxy - assembla depot name workaround (#2030)

* travisproxy -assembla workaround

Author: GbArc

lib/travis/vcs/perforce/clone.rb

@@ -97,7 +97,7 @@ def sparse_checkout
           end
 
           def dir
-            data.slug.split('/').last
+            assembla? ? 'depot' : data.slug.split('/').last
           end
 
           def port
@@ -115,6 +115,10 @@ def ticket
           def config
             data.config
           end
+
+          def assembla?
+            @assembla ||= data[:repository][:source_url].include? 'assembla'
+          end
       end
     end
   end