Add missing default values for oauth tables

- Give oauth_clients/oauth_authorization_codes redirect_uri a default value
- Default value for created
- Default values for scope and grant_types
Move oauth table created migration into the koauth module
Fix Migration_Oauth2_0_1_20140310135458::down()

The minimum value for TIMESTAMP is 1970-01-01 00:00:01
so we have to handle created = 0 differently
Explicitly add redirect_uri value's in Base.yml
Fix format of 'updated' column in Form Model
Trim whitespace in Form Model
Fix the way we set query strings in behat tests

Behat's auto parsing of the url was failing because 'http://' appeared
in our query string.