Adding a object interface to the __salt__ dictionary

This is another suggestion from @mgwilliams. It adds an object to the
sls file scope named Salt, which dispatches its attributes to the
__salt__ dictionary.

For example, the following two lines are functionally the same:

    ret = Salt.cmd.run(bar)
    ret = salt['cmd.run'](bar)
Adding a shortcut method for accessing Pillar data

Thanks to @erchn for the suggestion in #10517
Switch double to single quotes, fix pylint warning
Merge pull request #10600 from borgstrom/pyobjects_saltobject

Adding a object interface to __salt__ & __pillar__ (pyobjects)