Added ssh agent forwarding support
Fix regression re #230, thanks alisaifee
Merge branch '1.2' into 1.3

Conflicts:
	docs/changelog.rst
Merge branch '1.3'
Remove unnecessary test after fixing behavior
Merge remote-tracking branch 'bendavis78/master' into 72-agent-forwarding
Minor docs tweaks
Clean up & add docs; fixes #72
Print ssh lib version with Fabric version
Parallel now implies linewise output.

Fixes #482
Remove old debug output
Fix strange test failure I can't seem to nail down
Don't apply cd() to put()'s internals.

Fixes #342
Preserve use_sudo inside append()

Fixes #341
Fix re #397
Changelog entry re #397

Fixes #397
Set default username to None for bad getpwuid()

Fixes #400
Don't apply cd() to put()'s internals.

Fixes #342

Conflicts:

	docs/changelog.rst
Preserve use_sudo inside append()

Fixes #341
Fix re #397