Close input stream in RetrofitObjectPersister.readCacheDataFromFile (master)

Error when StrictMode enabled.

E/StrictMode﹕ A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
java.lang.Throwable: Explicit termination method 'close' not called
at dalvik.system.CloseGuard.open(CloseGuard.java:184)
at java.io.FileInputStream.(FileInputStream.java:80)
at com.octo.android.robospice.persistence.retrofit.RetrofitObjectPersister.readCacheDataFromFile(RetrofitObjectPersister.java:96)
at com.octo.android.robospice.persistence.file.InFileObjectPersister.loadDataFromCache(InFileObjectPersister.java:160)
at com.octo.android.robospice.persistence.CacheManager.loadDataFromCache(CacheManager.java:68)
at com.octo.android.robospice.request.DefaultRequestRunner.loadDataFromCache(DefaultRequestRunner.java:239)
at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:88)
at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:201)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:390)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)