Basic functionality for #5: Implement Text forecast

[AlexHilson]

This is a first pass at adding support for the regional text forecast.

The idea is that this allows requesting the 'raw' text forecast - as you can see from the example this requires a bit of work on the user side to make usable. This leaves room for a more opinionated implementation to be added later.

[jacobtomlinson]

Test failures are due to the API key not being set. This is fine as it is a PR and Travis hides the key for security.

Can you set the API_KEY environment variable and run nosetests -w tests/integration locally to confirm it is working.

[jacobtomlinson]

Recreated error with the following steps

$ docker run --rm -ti -v $(pwd):/usr/src/app python:2 /bin/bash
# cd /usr/src/app/
# pip install -r requirements.txt
# pip install nose
# python setup.py install
# nosetests -w tests/integration

Getting the following error

EE
======================================================================
ERROR: Failure: ImportError (No module named regions.RegionManager)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/nose/loader.py", line 418, in loadTestsFromName
    addr.filename, addr.module)
  File "/usr/local/lib/python2.7/site-packages/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/usr/local/lib/python2.7/site-packages/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/usr/src/app/tests/integration/manager_test.py", line 6, in <module>
    import datapoint
  File "/usr/local/lib/python2.7/site-packages/datapoint/__init__.py", line 9, in <module>
    from .Manager import Manager
  File "/usr/local/lib/python2.7/site-packages/datapoint/Manager.py", line 18, in <module>
    from .regions.RegionManager import RegionManager
ImportError: No module named regions.RegionManager

======================================================================
ERROR: Failure: ImportError (No module named regions.RegionManager)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/nose/loader.py", line 418, in loadTestsFromName
    addr.filename, addr.module)
  File "/usr/local/lib/python2.7/site-packages/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/usr/local/lib/python2.7/site-packages/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/usr/src/app/tests/integration/regions_test.py", line 6, in <module>
    import datapoint
  File "/usr/local/lib/python2.7/site-packages/datapoint/__init__.py", line 9, in <module>
    from .Manager import Manager
  File "/usr/local/lib/python2.7/site-packages/datapoint/Manager.py", line 18, in <module>
    from .regions.RegionManager import RegionManager
ImportError: No module named regions.RegionManager

----------------------------------------------------------------------
Ran 2 tests in 0.086s

FAILED (errors=2)

[jacobtomlinson]

Can you write a quick usage example for this?

See the current examples for inspiration.

[jacobtomlinson]

Perhaps this key should be here?