In preparation to move the group_vars plugin code into core.

	new file:   lib/ansible/inventory/vars_plugins/noop.py

Split out parsing of vars files to per host and per group
parsing, instead of reparsing all groups for each host. This enhances
performance.

Extend vars_plugins' API with two new methods:
* get host variables: only parses host_vars
* get group variables: only parses group_vars for specific group
The initial run method is still used for backward compatibility.

Parse all vars_plugins at inventory initialisation, instead of
per host when touched first by runner. Here we can also loop through
all groups once easily, then parse them.
This also centralizes all parsing in the inventory constructor.

	modified:   bin/ansible
	modified:   bin/ansible-playbook
	modified:   lib/ansible/inventory/__init__.py
	modified:   lib/ansible/inventory/vars_plugins/group_vars.py

Changed call to EDITOR to allow for parameters

The EDITOR environment variable is used to create and edit files in the vault.
But if the EDITOR variable contains parameters, subprocess.call() breaks.

This fixes the EDITOR environment variable to be safely split into a list.
It adds a dependency on shlex.

Fixes #5117

Fixes #6682

Properly revert changes introduced in #6579 

Fixes #6678
Fixes #6670

Added ansible_date_time.weekday as a fact. This returns Monday,Tuesday,W...

Fixes #5114

If something is executable but doesn't look like it should be, or if
something is NOT executable and DOES looks like it should, show a
more apropos error with a hint on correcting the problem

Fixes #5113

'changed' key is not defined when task fails

Typo: assign not equal in boolean guard variable

Fix TypeError when using old simplejson lib.

On some very old simplejson does not support the 'encoding' and give
following exception:

   TypeError: __init__() got an unexpected keyword argument 'encoding'

This fix runs json.dump with no encoding key (such as before #a023cb) on
TypeError exception only.

Typo when variable controlling list of hosts left as available

Fixes #6644

Fixes #6660

Fixes #6647

fix KeyError introduced by fix of #6591.

Added ansible_date_time.weekday as a fact. This returns Monday,Tuesday,Wednesday,Thursday,Friday,Saturday, or Sunday depending on the remote servers time. Useful for backups the way I use it

This reverts commit cbd1da64.

Merge branch 'atomic_move_restore_owner_group_rebase' of https://github.com/tyll/ansible into tyll-atomic_move_restore_owner_group_rebase

[docs] adds missing `'` to debconf examples

Some clarifications about workflow and the priority queue in GitHub

Add tesing deps installation into hacking/README

ec2: Adding type int for count (in line with other cloud modules)