put the build id in the output file urls

the url attribute will now give the preferred location for accessing
the output file, without the url having to be constructed by the web
client

test/unit/coffee/CompileControllerTests.coffee

@@ -75,7 +75,7 @@ describe "CompileController", ->
 							status: "success"
 							error: null
 							outputFiles: @output_files.map (file) =>
-								url: "#{@Settings.apis.clsi.url}/project/#{@project_id}/output/#{file.path}"
+								url: "#{@Settings.apis.clsi.url}/project/#{@project_id}/build/#{file.build}/output/#{file.path}"
 								path: file.path
 								type: file.type
 								build: file.build