Install: Fix install script freeze (syncdb superuser account creation)

Since the output is passed through tee, when the django admin asks the
user if he would like to create a super user account, it blocks the
install, without even showing the question.

Disabled interactivity for syncdb.

scripts/create-dev-env.sh

@@ -543,7 +543,7 @@ mkdir -p "$BASE/log"
 mkdir -p "$BASE/db"
 mkdir -p "$BASE/data"
 
-rake django-admin[syncdb]
+rake django-admin[syncdb,lms,dev,--noinput]
 rake django-admin[migrate]
 rake cms:update_templates
 # Configure Git