Reorganize user view.

Merge constants into the view itself.  Move the login decorator into the
app folder, since it's used everywhere, not just for users.
Rename users/forms.py to users/userForms.py.

Doesn't matter much - will be moving to a more client side form solution
soon.  I find wtforms too limiting & frustrating.
Rename all view files to their actual view name.
Last step in view refactor.

Move each individual view file out of its own folder and into one
'views' folder.  This more closely matches the layout of the rest of the
app: one folder for views, models and templates.  Nice.