Set personal Width/Height wrapper outter

Hi, with this small changes you can set the width and height of div wrapper outer. 

example:
```javascript
$("table").fixedTblHdrLftCol({
          wrapper:{
            outer:{
              height: 550,
              width: 600
            }
          }
        }); 
```
And the div with class ***fTHLC-outer-wrapper*** set this values for personal view