BUG: options.column_space doesn't behave at expected
The `column_space` option doesn't seem to work.  

```
In [28]: df=pd.DataFrame(np.array([np.random.randn(6), np.random.randint(1,9,6)*.1, 
                         np.zeros(6)]).T, columns=['A', 'B', 'C'], dtype='float')

In [29]: pd.set_option('column_space', 12)

In [30]: df
Out[30]: 
          A    B  C
0  0.865356  0.1  0
1 -0.968568  0.2  0
2 -0.584314  0.8  0
3  0.347676  0.6  0
4  0.296440  0.8  0
5 -0.129957  0.2  0

In [31]: pd.set_option('column_space', 2)

In [32]: df
Out[32]: 
          A    B  C
0  0.865356  0.1  0
1 -0.968568  0.2  0
2 -0.584314  0.8  0
3  0.347676  0.6  0
4  0.296440  0.8  0
5 -0.129957  0.2  0
```

In `frame.py`, the option seems to be named `col_space` but the doc string wasn't updated in `config_init.py`.  Happy to PR this, but, what is the agreed upon name/behavior? I like `col_space`? Does anyone have any background/history?
