New: initial SCP support
New: $st->fromHost()->downloadFile() and $st->usingHost()->uploadFile()
New: tests for file upload/download
New: ignore a few more things
Fix: drop the old way of injecting defaults from storyplayer.json
Merge branch 'develop' of github.com:datasift/storyplayer into develop

Conflicts:
	src/php/DataSift/Storyplayer/OsLib/Connector/SshClient.php