autosave implemented, default page path is s3n://spooky-pages/url-hash#(backtrace)/timestamp.
similar path for errordump and local errordump.
PhantomJSPath move to Const.
Fix a bug in TorDriverFactory.
PageBuilder now has SpookyContext to facilitate autosave
fix a bug in schemaRDD where source JsonRDD is used twice.
Add whatismyip to integration test for TorDriverFactory