Add Corp roles overview

- added basic views
- added helper to prettify the output of db query
- added migration for needed table 'eve_corporation_rolemap'
- added seeder for 'eve_corporation_rolemap'
- added logic to corporation controller to retrieve roles
- run ```php artisan db:seed --class EveCorporationRolemapSeeder``` to fill table as I did not find a way to trigger a post-migration seed yet

The UI needs some love I think, also the 'role log' is not pretty formatted at the moment.