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Replaces datasethelpers with pkg_resources.

- Added example data location to setup.py as package data.
- Added example/prediction/data files to MANIFEST.
- Updated tests to use pkg_resources to fetch data files.
- Updated example code to fetch data through pkg_resources.
- Used pkg_resources to load files in nupic.data code.
- Removing datasethelpers and tests.
- Updated tests to write data files into examples/prediction/data.
- Updated experiment runner to resolve paths better.
    - The experiment stream source could be an absolute path or a
      path relative to the "examples.prediction.data" pkg_resource.  Updated its logic to identify absolute paths and convert relative paths through pkg_resources.
    - Updated swarming test configuration.
        - A bunch of the swarming test configurations were expecting datasethelpers to find the input file on a search path that doesn't exist anymore. I solved this by:
            - moving test_data.csv from tests/swarming/nupic/swarming/data into the package_data directory in the "swarming" folder
            - adding __init__.py to the swarming folder mentioned above
            - updating ModelRunner to call normalizeStreamSources(), which now does the pkg_resoruces lookup
            - updating all the description files to refer to "swarming/test_data.csv"

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