fixes exception raised when url was a local file and before filter was set
added a few comments on readme
* added file method to feed definition. Now, you can get the file definition using:  feed_definition_instance.file :agency
* added FeedDefinition.aliases method. Now you can get the hash with the :alias => :file_column_name.
* [jugaad patch] source_updater to process files in the order in which they were added in the feed_definition...
* improved patch that sets the order of processing files
Merge pull request #2 from merlos/develop

Allow file sources and custom parsing order.