Boolean comparison vs tuple fails in 0.17.0
Just updated to 0.17.0 (python 2.7.9 on OS X Yosemite) and I found the following:

```
>>> import pandas as pd
>>> pd.__version__
u'0.17.0'
>>> s = pd.Series([(1,1),(1,2)])
>>> s==(1,2)
0    False
1    False
dtype: bool
```

Meanwhile in 0.16.2:

```
>>> import pandas as pd
>>> pd.__version__
'0.16.2'
>>> s = pd.Series([(1,1),(1,2)])
>>> s==(1,2)
0    False
1     True
dtype: bool
```
