library/pip: add support for virtualenv's --system-site-packages.

Fix Issue #2025 where templates were not being transfered.

Probably output is not useful if not used with --limit

Works well with --check mode

Use yaml.safe_dump rather than yaml.dump. No more "!!python/unicode".

No authentication when ansible-playbook is called with --syntax-check

This allows accessing inventory data from nodes that have not been
talked to (yet).

Documentation Fixes relating to OSX and macports

Specify repo option with hg pull

Fix yum module examples: the 'pkg' parameter is now 'name'

Add ConnectTimeout=DEFAULT_TIMEOUT to ssh args

always restart the program when state=restarted

Fixes #1994.

Clarification on how to use insertafter with a regex.

For ansible --list-hosts benefit apply hosts selection limits early

Fixes #1988.

Happens with e.g. "command: true" that YAML helpfully converts to a
bool.

Fixing bug with unicode templates

The utils.md5s() function would break when calculating checksums
for non-ascii characters. Convert to utf-8 first.

Fixes #1989

Insert some notes about installing on OSX via macports

Fixes #1983.

Fixes #1980.

This implements a basic --check mode which for now is only implemented on template & copy operations.  More detail will be shared with the list
shortly.