Changed so that the poststreams.py script takes a filename as an argument. Also updated the README file and removed extra endlines in the files financialstreams and weatherstreams.
Updated the README with some information about creating your own streamfiles
Merge pull request #210 from projectcs13/Sp8.Sc1.filename_as_parameter_poststreams

Sp8.sc1.filename as parameter poststreams
fixed an error,should pass the tests
updated triggers after changing the type of message sent in datapoints.erl