ExcelFile class has no attribute 'encoding'. Is it correct?
#### Code Sample

```python
import os
import pandas as pd

directory = '/Data'
# more than 300 files
for d, dirs, files in os.walk(directory):
    # i can not use read_excel function because i do not know how many sheets in each xls
    # i use instance of ExcelFile
    # in fact it returns xlrd.Book instance (because engine: Acceptable values are None or ``xlrd``)
    try
        current_file = pd.ExcelFile(os.path.join(d,f))
        #do not work. My files use cp1251 charset. See more in output
    except UnicodeDecodeError:
        pass

    sheet_names_ = current_file.sheet_names()
    for sn in current_file.sheet_names():
        # this Data Frame i shoud parse and import to my Pstgresql DB
        current_file.parse(sheet_name=sn)
```

#### Problem description

I have a lot of XLS files encoded with cp1251. Each file contains 1 or more sheets. I need to import them into my Postgesql DB. But Pandas can not do it simple. I can load one sheet  (list of, but i don`t have it) at a time in any encoding using pandas.read_excel(file,encoding=my_encoding). Or I can load all sheets from all files in UTF encoding using instance of pandas.ExcelFile(file). It looks like some bad recursion.
I can use xlrd to read my files with specific charset to get xlrd.Book instance. Then pass it to pandas.read_excel(). But I do not like this decision.

If pandas.ExcelFile() would have an attribute of the encoding, then it could be passed to any "engine". I saw a new version of excel package. The same problem.

(I dont have MS Excel and can not create "bad" file for test)
 Sorry for my english(((
#### Expected Output

#### Output pandas/xlrd Error

<details>

*** No CODEPAGE record, no encoding_override: will use 'ascii'
*** No CODEPAGE record, no encoding_override: will use 'ascii'
Traceback (most recent call last):
  File "TableLoader.py", line 13, in <module>
    c = ExelLoader()
  File "TableLoader.py", line 10, in ExelLoader
    my_xls_x = pandas.read_excel('Data/qq.xls')
  File "/home/dz/.local/lib/python3.6/site-packages/pandas/util/_decorators.py", line 188, in wrapper
    return func(*args, **kwargs)
  File "/home/dz/.local/lib/python3.6/site-packages/pandas/util/_decorators.py", line 188, in wrapper
    return func(*args, **kwargs)
  File "/home/dz/.local/lib/python3.6/site-packages/pandas/io/excel.py", line 350, in read_excel
    io = ExcelFile(io, engine=engine)
  File "/home/dz/.local/lib/python3.6/site-packages/pandas/io/excel.py", line 653, in __init__
    self._reader = self._engines[engine](self._io)
  File "/home/dz/.local/lib/python3.6/site-packages/pandas/io/excel.py", line 424, in __init__
    self.book = xlrd.open_workbook(filepath_or_buffer)
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/__init__.py", line 157, in open_workbook
    ragged_rows=ragged_rows,
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/book.py", line 120, in open_workbook_xls
    bk.get_sheets()
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/book.py", line 723, in get_sheets
    self.get_sheet(sheetno)
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/book.py", line 714, in get_sheet
    sh.read(self)
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/sheet.py", line 820, in read
    strg = unpack_string(data, 6, bk.encoding or bk.derive_encoding(), lenlen=2)
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/biffh.py", line 250, in unpack_string
    return unicode(data[pos:pos+nchars], encoding)
  File "/home/dz/.local/lib/python3.6/site-packages/xlrd/timemachine.py", line 31, in <lambda>
    unicode = lambda b, enc: b.decode(enc)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xcd in position 0: ordinal not in range(128)

</details>

#### Output of `pd.show_versions()`

<details>

INSTALLED VERSIONS
------------------
commit: None
python: 3.6.7.final.0
python-bits: 32
OS: Linux
OS-release: 4.15.0-45-generic
machine: i686
processor: i686
byteorder: little
LC_ALL: None
LANG: ru_RU.UTF-8
LOCALE: ru_RU.UTF-8

pandas: 0.24.1
pytest: None
pip: 9.0.1
setuptools: 39.0.1
Cython: None
numpy: 1.16.2
scipy: None
pyarrow: None
xarray: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.8.0
pytz: 2018.9
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: None
openpyxl: None
xlrd: 1.2.0
xlwt: None
xlsxwriter: None
lxml.etree: None
bs4: None
html5lib: 0.999999999
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: None
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None
gcsfs: None

</details>
