* Converts example/flaskr to have a setup.py
Makes the flaskr app easier to run, ex. workflow:
- pip install --editable .
- export FLASK_APP=flaskr.flaskr
- flask initdb
- flask run
Testing is also easier now:
- python setup.py test
* Fixed an import error in flaskr/tests
- the statement `import flaskr` caused errors in python3
- `from . import flaskr` fixes the issue in 2.7.11 and 3.5.1
* Better project structure and updates the docs
- Re-factors *flaskr*'s project structure a bit
- Updates docs to make sense with the new structure
- Adds a new step about installing Flask apps with setuptools
- Switches first-person style writing to second-person (reads better IMO)
- Adds segments in *testing.rst* for running tests with setuptools
* Remove __init__.py from tests
- py.test recommends not using __init__.py
* Fix testing import errors
