fix MatrixForm, TableForm command line formatting #153

Current Behaviour:
```
In[1]:= {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}} // MatrixForm
Out[1]= 1   0   0
 . 
 . 0   1   0
 . 
 . 0   0   1

In[2]:=
```

Fix:
```
In[1]:= {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}} // MatrixForm
Out[1]= 1   0   0
      . 
      . 0   1   0
      . 
      . 0   0   1

In[2]:=
```

Proposed new formatting (This PR):

```
In[1]:= {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}} // MatrixForm
Out[1]= 1   0   0
        
        0   1   0
        
        0   0   1

In[2]:=
```

I think it looks cleaner without the dots, but I'm interested in what other people think.

For reference, MMA8 does this 

```
In[1]:= {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}} // MatrixForm

Out[1]//MatrixForm= 1   0   0

                    0   1   0

                    0   0   1

In[2]:= 
```