array_equivalent has disappeared from pandas.core.common in version 0.19, is this a mistake?
#### A small, complete example of the issue

```python
# Your code here
import pandas
import pandas.core.common as com
print com.array_equivalent
```

#### Expected Output
```python
# expect something like:
# <function array_equivalent at 0x000000000445A198>
# But I get
```
```
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-2-fc6fc07906df> in <module>()
----> 1 print com.array_equivalent

AttributeError: 'module' object has no attribute 'array_equivalent'
```
#### Output of ``pd.show_versions()``

<details>
# Paste the output here pd.show_versions() here
INSTALLED VERSIONS
------------------
commit: None
python: 2.7.11.final.0
python-bits: 64
OS: Windows
OS-release: 7
machine: AMD64
processor: Intel64 Family 6 Model 60 Stepping 3, GenuineIntel
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: None.None

pandas: 0.19.0
nose: 1.3.7
pip: 8.1.2
setuptools: 23.0.0
Cython: 0.24.1
numpy: 1.11.1
scipy: 0.17.1
statsmodels: 0.6.1
xarray: None
IPython: 4.1.2
sphinx: 1.3.5
patsy: 0.4.0
dateutil: 2.5.1
pytz: 2016.2
blosc: None
bottleneck: 1.0.0
tables: 3.2.2
numexpr: 2.6.1
matplotlib: 1.5.1
openpyxl: 2.3.2
xlrd: 0.9.4
xlwt: 1.0.0
xlsxwriter: 0.8.4
lxml: 3.6.0
bs4: 4.4.1
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: 1.0.12
pymysql: None
psycopg2: None
jinja2: 2.8
boto: 2.39.0
pandas_datareader: None
</details>
