Add /proc/cmdline information to the default facts

Add support for RSA/DSA SSH host key detection in setup module for OS/X

Added to_yaml and from_yaml filters to Jinja environment.

	s/<8spaces>/<4spaces>/g

The use-case here is that based on information in the /proc/cmdline certain actions can be taken.

A practical example in our case is that we have a play at the end of the provisioning phase that reboots the system. Since we don't want to accidentally reboot a system (or restart the network) on a production machine, having a way to separate an Anaconda post-install (sshd in chroot) with a normal system is a good way to make that distinction.

    ---
    - name: reboot
      hosts: all
      tasks:
      - action: command init 6
        only_if: "not '${ansible_cmdline.BOOT_IMAGE}'.startswith('$')"

A practical problem here is the fact that we cannot simply check whether it is set or empty:

    ---
    - name: reboot
      hosts: all
      tasks:
      - action: command init 6
        only_if: "'${ansible_cmdline.BOOT_IMAGE}'"

If ansible_cmdline was a string, a simple only_if: "'${ansible_cmdline}'.find(' BOOT_IMAGE=')" was an option, but still not very "beautiful" :-/

This implementation uses shlex.split() and uses split(sep, maxsplit=1).

Fixed a parsing HEAD problem, when ansible is checked out as a submodule

Use `get_bin_path` properly for supervisorctl module

Keep result pristine for ignore_errors

Fixed a parsing HEAD problem, when ansible is checked out as a
submodule in git

Allow ~ expansion in chdir argument of command module

This allows the use of ~ in the chdir argument of the command module
I know the later change is absolutely necessary as the first change
was not sufficient. It may be that the first change fixes shell and
the second fixes command.

Subversion dest should allow ~ expansion

Used os.path.expanduser on dest to allow e.g. ~/svn/repo as
a destination