Fix SFTP

2.5.2

update travis env

Fixed composer.json

There was an issue with the composer file. Resolved now.

Adjusting to Composer and CakePHP 2.5+

The plugin was transferred from shama to fotografde to support maintenance from here on.

It is now fully composer-based CakePHP 2.5+ compatible and travis is enabled for all current versions to assert this.

With this release the plugin relies on composer as installer. The vendor will also be included this way.
It is still possible, however, to manually install the plugin and also to manually include the Vendor files as APP/Vendor ones if necessary.