float formatting issue
see first value

``` python
In [1]: import pandas

In [2]: pandas.__version__
Out[2]: '0.7.0.dev-e3df4e2'

In [3]: df = pandas.DataFrame({'A': [746.03, 0.00, 5620.00, 1592.36]})

In [4]: df
Out[4]:
   A
0  746.
1  0.00
2  5620
3  1592

In [5]:                  
```
