learningequality/ka-lite-installer-windows — pull request #48 by cpauya (2014-10-23 11:07:29+00:00)
Title: Fix for #45-Check validity of username during installation.

Hi @ruimalheiro

This fixes #46 - Check validity of username during installation.

We now validate the following:

* username length max of 75 characters
* password length max of 128 characters
* username allowed characters are "letters, numbers and @/./+/-/_ characters" based on `django.contrib.auth.models.AbstractUser`

See attached screenshot for an example.

/cc @aronasorman

![ka-lite-windows-installer-2014-10-23a](https://cloud.githubusercontent.com/assets/175580/4751952/8758ffa4-5aa4-11e4-870d-de7c62e84e18.png)