* Rename fail_on_rc_non_zero to check_rc, much more succinct.
* Simplify method defintion
* Fix command module and drop shell=shell option; whether to use
  shell is determined by if args is a list.

This updates apt, apt_repository, command, cron, easy_install, facter,
fireball, git, group, mount, ohai, pip, service, setup, subversion,
supervisorctl, svr4pkg, user, and yum to take advantage of run_command
in module_common.py.

  - .rst now supresses default if none is set (looks better in HTML)
  - .rst now handles empty options list
  - Fixed postgresql_user and mysql_user because YAML contained colons
  - docs for facter

Make pep8 tests run against the library directory as well, and associated tweaks (mostly to indentation) in the library
directory.

Add encoding lines to python modules such that they can take unicode options if they are fed them, since the
AnsibleModule stuff no longer base64 encodes for simplicity and speed reasons.

Port the file module over to the new common code infrastructure + cleanup some redundant imports since the module code already imports those things.

Port the ohai module over, while this is actually *longer* now, not transferring the args file makes this much
faster.

The ohai and facter modules use /usr/bin/logger to log the fact that
they have been invoked.  I added 'import os' to the ping module
so that it could have the same syslog statements as the other modules.
I separated the condensed:
    shlex.split(open(argfile, 'r').read())
into two separate statements similar to the other modules.

If the module result contains "ansible_facts", that will be added to the setup
cache.

this until we figure out what that is.

and treeish saving everywhere.

there are probably some quirks here we'll want to refine further later, for instance, we should
be able to do nicer things with "can't contact host tracebacks".