Added 'given_command' to local() 'out'

This makes adds the 'command' attribute to local()'s return, as
in run() and sudo() to make the initial command accessible after
execution.
Update changelog for 1.7.3
Merge branch '1.7' into 1.8

Conflicts:
	docs/changelog.rst
Add 1.8.3 to changelog
Merge branch '1.8'

Conflicts:
	docs/changelog.rst
Update Releases requirement for needed bugfixes
Merge branch '1.7' into 1.8
Merge branch '1.8'
Modified changelog w/o releasing...
Merge branch '1.7' into 1.8

Conflicts:
	docs/changelog.rst
Merge branch '1.8'
Bump 1.7.3 for setup.py tweak
Merge branch '1.7' into 1.8 & cut 1.8.3

Conflicts:
	fabric/version.py
Merge branch '1.8'
replace non-existing log_action() with print()

Inspired by: [Python Fabric NameError: global name 'log_action' is not defined](http://stackoverflow.com/q/22696486/4279)
Permit Paramiko >=1.13 under Python 2.6+

Re #1105
Changelog re #1105, fixes #1105
Merge branch '1.7' into 1.8

Conflicts:
	docs/changelog.rst
Merge branch '1.8'
Releases version bump for bugfix