Users signup

[borja]

Add the required views, templates, etc to allow users to create accounts in openworkouts.

The workflow:

1- load openworkouts, go to signup

2- fill in a form with the required data

3- account is created, but in "pending"/"activation required" state

4- send an email to the given email address including a link to activate the account. That link will be valid for N days (configurable in the ini settings) and can be used only one.

5- if after N days the user does not activate the account, the account is removed

6- if the user clicks on the link, the account gets activated and the user can log in (maybe log him hin automatically?).

[borja]

Update: A basic signup procedure has been implemented already in source:OpenWorkouts-current, so I've updated the description of the ticket. We still need the code to put users in "pending confirmation" state, send email, etc.

[borja]

Users can sign up in a basic way right now, which is enough for version 0.1, in 0.2 we can extend the sign up process with the rest of the tasks

[borja]

User verification implemented here: changeset:76ebb1b/OpenWorkouts-current

[borja]

Task to handle sending the verify emails added here: changeset:b5d87e0/OpenWorkouts-current

[borja]

I've added three smaller tickets as follow-ups of this one:

#61 - Better templates for "verify your account" emails

#62 - Tasks scheduler using huey

#63 - Delete users waiting verification for more than N days

right now, signup and verify are in a state that is usable and "good enough" for this version of openworkouts.

[borja]

And, added some helpers to the installer, telling users what to do in order to enable email sending (changeset:91517b1/OpenWorkouts-current).

With this, we have the sign up covered. Not ideal for non-techie users, but we can improve this afterwards.