Werkzeug, Flask-WTF, WTForms, Flask-Bcrypt, Flask-DebugToolbar

See mitsuhiko/flask#1135

Fix breaking change from Flask-Migrate

Flask-Migrate was recently patched to version 1.3.1 because [alembic versions can now include parts that are not integers](https://github.com/miguelgrinberg/Flask-Migrate/pull/51).

Requiring Flask-Migrate 1.3.0 installs a version of alembic that results in the following error message on startup:

`ValueError: invalid literal for int() with base 10: 'post2'`

Changing the requirements to install Flask-Migrate 1.3.1 fixes this problem.

Fix formatting errors.

New User. No database installed yet and the Welcome page does not require a database to demonstrate the server is working and links work etc. I anticipate setting up SQLAlchemy is the next step.

New user, had to experiment/google to figure out no-white-space in blah='stuff'.

Move DebugToolbar to prod requirements to prevent import error.

updated requirements to latest version

Fixes #25

[fixes #23]

Use explicit relative import instead of implicit.

Implicit relative imports are discouraged
(http://legacy.python.org/dev/peps/pep-0008/#imports) and no longer supported
in python 3.