chunksize argument removed from read_excel?
#### Code Sample

```python
import pandas as pd

excel = pd.ExcelFile("test.xlsx")

for sheet in excel.sheet_names:
    reader = excel.parse(sheet, chunksize=1000)
    for chunk in reader:
        # process chunk
```
#### Problem description

In version 0.16.1 the chunksize argument was available.

See: http://pandas.pydata.org/pandas-docs/version/0.16.1/generated/pandas.ExcelFile.parse.html

But in latest version it's not available.

https://pandas.pydata.org/pandas-docs/stable/generated/pandas.ExcelFile.parse.html

What was the reason that it was removed?

Also, how should I process excel file by chunks in latest version?
