Could have used shutil.copy rather than shutil.copyfile, but this
implementation preserves the md5 comparison to avoid unnecessary copies

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.

Changing the parameter names to be consistent, and adding root user default with empty password, as per mysql standard

the apt module to use it

the 'chdir' argument changes the current working directory to the
fullpath supplied as its value, before the execution of the command.

Convert git module to module magic.
Drop cruft no longer needed.
Standardize indent to 4 spaces in methods switchLocalBranch, reset,
clone, and get_version.
Update is_local_branch to also handle '* branch' format.
Add is_current branch method()
Update pull() method to use is_current_branch()

passwd -> password
loginpass -> login_password
loginuser -> login_user
loginhost -> login_host

Add an example playbook that shows how to use the modules.

The apt parameter changed from update-cache to update_cache, but
the error message still mentioned update-cache

Tweak alias consistency a bit.  'package' has never been documented, but since it works, make it work in both places.
'name' is the preferred form.  Similarly, take 'name' for the 'guest' argument to the 'virt' module.

These modules are based on the mysql_db and mysql_user modules.

Currently, the postgresql_user module can only grant all permissions
on a database, fine-grained access has not been implemented yet.

Check file exists instead of relying on the exception. Leave the exception catch in, in case the file is deleted or some other issue crops up

Changing to read from a file pointer instead so that an exception is thrown if the file doesn't exist

1. Passing the module to the various functions so that they can use module.fail_json and module.exit_json methods inside.
2. Because of point 1, install and remove methods do not return anything. Instead, they use the module functions itself.
3. Move the import statement (for apt and apt_pkg) inside main function so on import error, we can use module.fail_json to print the error.

This drops the branch option.  The version option is overloaded
to mean either a sha1, branch, or tag.  This also adds the option
'remote' which defaults to 'origin'.
clone() was simplified by removing the checkout operation.  That
happens later when switch_version() is called.

Added the methods get_branches(), is_remote_branch(), and
is_local_branch().  get_branches() returns an array listing all
of the branches for the git repository.  is_remote_branch() checks
whether the arguments supplied correspond to a remote branch.
Similarly, is_local_branch() checks for a local branch.

The pull() method now checks to see if it is on the desired branch.
If not, it checks out the requested branch and then does a pull.
This should keep issue #604 still fixed.

switch_version(), formerly switchver(), looks to see if it is
checking out a branch.  If a branch, it checks it out with the --track
option.  This type of checkout was in pull() before.

Updated pull, clone, and switch_version to return (rc, out, err).

Port command module over to new common code.  Notice that this has to subclass AnsibleModule -- this should be the only
one that has to do that.