FuelPHP: allow core, modules and packages to be installed

```
lukea@ft02 
/var/www/fuel $ composer install
Loading composer repositories with package information
Installing dependencies
  - Installing fuelphp/upload (dev-master 7c8158a)
    Cloning 7c8158a71d690013f57e796ee8a287cb8b6b5c4a

  - Installing composer/installers (dev-fuelphp-support 7941e25)
    Cloning 7941e25f5ef72870337bbe427b302823e82c6a66

  - Installing fuel/core (dev-composer-installers cae0ffb)
    Cloning cae0ffba70fa87a3ee671aefd5a43b679c6f220b

  - Installing fuel/auth (dev-composer-installers 76ee813)
    Cloning 76ee813763fb6d4f35885c1f0b90f19c36eca2da

  - Installing fuel/email (dev-composer-installers 2233333)
    Cloning 223333377bcfdc7d13f381deedbda1fc04fb8dd7

  - Installing fuel/oil (dev-composer-installers 5da935e)
    Cloning 5da935e28e610ef46a70307d883620c8696114dc

  - Installing fuel/orm (dev-composer-installers c5d2787)
    Cloning c5d27874b2671098c349292b37acc4ae2a58b550

  - Installing fuel/parser (dev-composer-installers 920ed81)
    Cloning 920ed81a6b53e3cea8d7d4c1b1a5537b7141a7e4

  - Installing psr/log (1.0.0)
    Loading from cache

  - Installing monolog/monolog (1.3.1)
    Loading from cache

monolog/monolog suggests installing mlehner/gelf-php (Allow sending log messages to a GrayLog2 server)
monolog/monolog suggests installing raven/raven (Allow sending log messages to a Sentry server)
monolog/monolog suggests installing doctrine/couchdb (Allow sending log messages to a CouchDB server)
monolog/monolog suggests installing ext-amqp (Allow sending log messages to an AMQP server (1.0+ required))
monolog/monolog suggests installing ext-mongo (Allow sending log messages to a MongoDB server)
Writing lock file
Generating autoload files
```