Suppress UnicodeEncodeError when executing to_csv method
#### Code Sample, a copy-pastable example if possible

```python
# error pattern
import pandas as pd

unicode_data = [["key", "\u070a"]]
df = pd.DataFrame(unicode_data)
df.to_csv("./test.csv", encoding="cp932") # UnicodeEncodeError: 'cp932' codec can't encode character '\u070a' in position 6: illegal multibyte sequence
```

```python
# good pattern
import pandas as pd

unicode_data = [["key", "\u070a"]]
df = pd.DataFrame(unicode_data)
with open("./test.csv", mode="w", encoding="cp932", errors="ignore") as f:
    df.to_csv(f)
```

#### Problem description

UnicodeEncodeError occurs when executing to_csv with eoncode parameter SHIFT-JIS or cp932.
We are able to avoid this error using `with open`(good pattern), this code is redundant.
So I want to suppress UnicodeEncodeError with to_csv's parameter.

#### Expected Output

```python
# good pattern
import pandas as pd

unicode_data = [["key", "\u070a"]]
df = pd.DataFrame(unicode_data)
df.to_csv("./test.csv", encoding="cp932", ignore_error=True)
```


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

<details>

INSTALLED VERSIONS
------------------
commit           : None
python           : 3.7.2.final.0
python-bits      : 64
OS               : Darwin
OS-release       : 18.6.0
machine          : x86_64
processor        : i386
byteorder        : little
LC_ALL           : None
LANG             : ja_JP.UTF-8
LOCALE           : ja_JP.UTF-8

pandas           : 0.25.0
numpy            : 1.16.2
pytz             : 2018.9
dateutil         : 2.8.0
pip              : 19.0.3
setuptools       : 40.8.0
Cython           : None
pytest           : 4.3.1
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : None
IPython          : None
pandas_datareader: None
bs4              : None
bottleneck       : None
fastparquet      : None
gcsfs            : None
lxml.etree       : None
matplotlib       : None
numexpr          : None
odfpy            : None
openpyxl         : 2.6.1
pandas_gbq       : None
pyarrow          : None
pytables         : None
s3fs             : None
scipy            : None
sqlalchemy       : 1.3.1
tables           : None
xarray           : None
xlrd             : 1.2.0
xlwt             : None
xlsxwriter       : None

</details>
