Adding big offset to timedelta generates a python crash
#### Code Sample, a copy-pastable example if possible
##### In:

```
import pandas as pd
from pandas.tseries.frequencies import to_offset

d = pd.Timestamp("2000/1/1")
d + to_offset("D")*100**25
```
##### Out:

**=> python crash**

Fatal Python error: Cannot recover from stack overflow.

Current thread 0x00002b00 (most recent call first):
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 2526 in delta
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 2535 in apply
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 2493 in **add**
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 390 in **radd**
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 2535 in apply
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 2493 in **add**
  File "C:\Users\geoffroy.destaintot\Miniconda3\envs\pd-0.18\lib\site-packages\pandas\tseries\offsets.py", line 390 in **radd**
...
#### Expected Output

Satisfactory behaviour when using python timedeltas:
##### In:

```
import datetime as dt
import pandas as pd
from pandas.tseries.frequencies import to_offset

d = pd.Timestamp("2000/1/1")
d + dt.timedelta(days=1)*100**25
```
##### Out:

**=> python error**

Traceback (most recent call last):
  File "C:/Users/geoffroy.destaintot/Documents/Local/Informatique/Projets/2016-08-django-debug/to_offset_bug.py", line 11, in <module>
    d + dt.timedelta(days=1)_100_*25
OverflowError: Python int too large to convert to C long
#### output of `pd.show_versions()`

(same behaviour with pandas 0.17.1, 0.16.2, 0.15.2)
## INSTALLED VERSIONS

commit: None
python: 3.5.2.final.0
python-bits: 64
OS: Windows
OS-release: 10
machine: AMD64
processor: Intel64 Family 6 Model 69 Stepping 1, GenuineIntel
byteorder: little
LC_ALL: None
LANG: None

pandas: 0.18.1
nose: None
pip: 8.1.2
setuptools: 25.1.6
Cython: None
numpy: 1.11.1
scipy: None
statsmodels: None
xarray: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.5.3
pytz: 2016.6.1
blosc: None
bottleneck: None
tables: None
numexpr: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: None
boto: None
pandas_datareader: None
