Adjustments in local install documentation

Hi,

In the documentation on how to install escriptorium locally, it is said:

It is then recommended to set $DJANGO_SETTINGS_MODULE

$ export $DJANGO_SETTINGS_MODULE escriptorium.local_settings

But I get the following error:

(env) achague@achague-vm:~/Documents/escriptorium$ export $DJANGO_SETTINGS_MODULE escriptorium.local_settings
bash: export: `escriptorium.local_settings': not a valid identifier

Following Django's documentation, I suggest this line be changed to:

$ export DJANGO_SETTINGS_MODULE=escriptorium.local_settings