optimization when adding child groups

fixed first_available_file and roles support for copy and template action

for copy and template action

Trivial typo fix in Amazon documentation

Updates to ansible-pull and ansible-pull docs

due to initial copy.  New model will reuse the first object and copy attributes on the second.

fix utf-8 named task failed with --step.

Support for all:vars in script inventories

os.path.dirname returns '' not None in some cases, handle this so inventory can be specified with ./

add mention of github.com/ginsys/ansible-plugins in contrib.rst

Add option to specify inventory.  No default is defined since
ansible-playbook already does this and it allows an ansible.cfg in the
git repository to take precedence.
Overall, this should help ansible-pull work with less setup in advance,
which should be helpful in kickstart scenarios.  Much of this was
discussed in issue #2464.

Example:

when: registered_variable|failed