Series is missing real/imag attributes
The `Series` class in 0.10 had a `real` and  a `imag` attribute but in 0.12dev these attrs are missing. This probably happend during the refactoring of the Series class for 0.12.

``` python
In [1]: pd.__version__
Out[1]: '0.10.0'

In [2]: a = np.arange(5)

In [3]: b = pd.Series(a + 4j*a)

In [4]: b.real
Out[4]: 
0    0
1    1
2    2
3    3
4    4
```

``` python
In [1]: pd.__version__
Out[1]: '0.12.0-381-g15d5f0a'

In [2]: a = np.arange(5)

In [3]: b = pd.Series(a + 4j*a)

In [4]: b.real
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-ec5ddb077f9e> in <module>()
----> 1 b.real

/usr/lib64/python2.7/site-packages/pandas-0.12.0_381_g15d5f0a-py2.7-linux-x86_64.egg/pandas/core/generic.pyc in __getattr__(self, name)
   1287             return self[name]
   1288         raise AttributeError("'%s' object has no attribute '%s'" %
-> 1289                              (type(self).__name__, name))
   1290 
   1291     def __setattr__(self, name, value):

AttributeError: 'Series' object has no attribute 'real'
```
