implemented attribute streams
Fixed double close in ssh inputstream
Implemented ssh output streams.
Merge remote-tracking branch 'origin/develop' into feature/ssh-adaptor-3

Conflicts:
	adaptors/ssh/src/nl/esciencecenter/octopus/adaptors/ssh/SshDirectoryAttributeStream.java
	adaptors/ssh/src/nl/esciencecenter/octopus/adaptors/ssh/SshFiles.java
Merge pull request #19 from NLeSC/feature/ssh-adaptor-3

Feature/ssh adaptor 3