Bar plot of dataframe - missalignes of ticks (with labels) and bars
#### Code Sample

```python
import pandas as pd
import io
%matplotlib inline

data = ',#67,#85,#94\n2010-08-16,0,30,0\n2010-08-18,0,2,0\n2011-03-07,0,32,0\n2012-04-27,1,0,0\n2016-11-07,31,0,0\n2016-11-11,32,0,0\n2017-05-21,0,0,2\n2017-06-21,0,0,2\n2017-07-18,0,0,2\n'


filelike = io.StringIO(data)
occurances_df = pd.read_csv(filelike,index_col=0)
occurances_df.plot(kind='bar',align="center")

```
![pandasproblem](https://user-images.githubusercontent.com/5279578/34519330-b454bd54-f083-11e7-973d-b8a42f7c1617.PNG)

Link to notebook https://gist.github.com/hawkerpl/ab2e3afd1e6062c5bd6e2e3e6b99e770

#### Problem description

So the problem is as you can see that although i use the `align="center"` the bars are not aligned with the ticks.
