fix database models naming.
By the past the rule for model fields was the 2 first letter of the model, the 2 first letter of the associated
object, and the name of the field.
For example, the field user_id in the Message model from the Ticket module was named: me_us_id.
This commit remove this behavior.

Closes #139
fix db config
Merge pull request #195 from jeremyletang/db-fields

fix database models naming.