Add basic command line framework

`wutta setup` is the only real sub/command yet, and it does nothing

docs/index.rst

@@ -17,7 +17,8 @@ Much remains to be done, and it may be slow going since I'll be trying
 to incorporate this package into the main Rattail package along the
 way.  So we'll see where this goes...
 
-At this point the main focus is the configuration interface.
+Main points of focus so far are the configuration and command line
+interfaces.
 
 
 Basic Usage
@@ -37,6 +38,7 @@ Create a config file, e.g. ``my.conf``:
    bar = A
    baz = 2
    feature = true
+   words = the quick brown fox
 
 In your app, load the config and reference its values as needed::
 
@@ -44,13 +46,18 @@ In your app, load the config and reference its values as needed::
 
    config = make_config('/path/to/my.conf')
 
-   config.get('foo.bar')                # returns 'A'
+   # this call..                        ..returns this value
 
-   config.get('foo.baz')                # returns '2'
-   config.get_int('foo.baz')            # returns 2
+   config.get('foo.bar')                # 'A'
 
-   config.get('foo.feature')            # returns 'true'
-   config.get_bool('foo.feature')       # returns True
+   config.get('foo.baz')                # '2'
+   config.get_int('foo.baz')            # 2
+
+   config.get('foo.feature')            # 'true'
+   config.get_bool('foo.feature')       # True
+
+   config.get('foo.words')              # 'the quick brown fox'
+   config.get_list('foo.words')         # ['the', 'quick', 'brown', 'fox']
 
 
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