Update 2012_12_06_225921_migration_cartalyst_sentry_install_users.php

Added indexes for activation_code and reset_password_code: so that methods findByActivationCode() and findByResetPasswordCode() are less time consuming.
Merge pull request #226 from semalead/patch-1

Update 2012_12_06_225921_migration_cartalyst_sentry_install_users.php
Update mysql.sql

Small fix related to https://github.com/cartalyst/sentry/pull/226
Theses 2 indexes have been added to migration files, so they should also be added to this database structure dump file.
Merge pull request #227 from semalead/patch-1

Update mysql.sql