Add support for specifying arguments with a dictionary instead of having to specify them as a list of single key value dictionary items.

Instead of having the specify the arguments to a state module like:

id1:
  cmd.run:
    - name: echo testing
    - umask: '0'

support

id1:
  cmd.run:
    name: echo testing
    umask: '0'

When then state is written as python with the #!py python renderer instead of having the more verbose

"id1": {
    "cmd.run": [
        {"name": "echo testing"},
        {"umask": "0"},
    ]
}

it can be written more concisely and efficiently as

"id1": {
    "cmd.run": {
        "name": "echo testing",
        "umask": "0",
    }
}

This will make it easier for beginners trying to learn salt and reduces the number of data structures that have to be created.