- issue37 remove create/update date indexes and columns and add created_at and
  updated_at columns and indexes to be inline with Eloquent ORM

- unit test for above migration script

- move migration script tests to a new direcotry and change phpunit.xml
  to app directory as migration tests are not to be performed on regular
app test

- composer.json is updated to have 'Doctrine/DBAL' dependecy which is
  used by Laravel migration dropIndex method.

- put phpunit.sh linking to vendor/phpunit/phpunit/phpunit to save
  typing the long one and add an entry in gitignore to ignore this file.