Update namespace in MimePlugin.php

Wrong namespace (namespace Filicious\Plugin\Hash instead of namespace Filicious\Plugin\Mime)
Update method which gets MIME type

getMIMEType() was calling $adapter->getMimeName() instead of $adapter->getMimeType()
Merge pull request #82 from scrnjakovic/patch-1

Update namespace in MimePlugin.php
Merge pull request #83 from scrnjakovic/patch-2

MimeFilePlugin::getMIMEType() was calling MimeAwareAdapterInterface::getMimeName() instead of MimeAwareAdapterInterface::getMimeType().
Merge branch 'master' into develop