ENH: Support parsing <Month Name> <Day number> e.g. Jan 1 in date utilities
I assume that this was officially supported before. Haven't narrowed it down any more than sometime between 0.16.2 and 0.17.0.

``` python
In [1]: pd.__version__
Out[1]: '0.16.2'

In [2]: pd.date_range("Jan 1", "March 31", name="date")
Out[2]:
DatetimeIndex(['2015-01-01', '2015-01-02', '2015-01-03', '2015-01-04',
               '2015-01-05', '2015-01-06', '2015-01-07', '2015-01-08',
               '2015-01-09', '2015-01-10', '2015-01-11', '2015-01-12',
...
```

``` python
In [1]: pd.__version__
Out[1]: '0.17.0'

In [2]: pd.date_range("Jan 1", "March 31", name="date")
---------------------------------------------------------------------------
OutOfBoundsDatetime                       Traceback (most recent call last)
<ipython-input-2-8eaca08051ac> in <module>()
----> 1 pd.date_range("Jan 1", "March 31", name="date")

/Users/tom.augspurger/Envs/py3/lib/python3.5/site-packages/pandas/tseries/index.py in date_range(start, end, periods, freq, tz, normalize, name, closed)
   1912     return DatetimeIndex(start=start, end=end, periods=periods,
   1913                          freq=freq, tz=tz, normalize=normalize, name=name,
-> 1914                          closed=closed)
   1915
   1916

/Users/tom.augspurger/Envs/py3/lib/python3.5/site-packages/pandas/util/decorators.py in wrapper(*args, **kwargs)
     87                 else:
     88                     kwargs[new_arg_name] = new_arg_value
---> 89             return func(*args, **kwargs)
     90         return wrapper
     91     return _deprecate_kwarg

/Users/tom.augspurger/Envs/py3/lib/python3.5/site-packages/pandas/tseries/index.py in __new__(cls, data, freq, start, end, periods, copy, name, tz, verify_integrity, normalize, closed, ambiguous, dtype, **kwargs)
    234             return cls._generate(start, end, periods, name, freq,
    235                                  tz=tz, normalize=normalize, closed=closed,
--> 236                                  ambiguous=ambiguous)
    237
    238         if not isinstance(data, (np.ndarray, Index, ABCSeries)):

/Users/tom.augspurger/Envs/py3/lib/python3.5/site-packages/pandas/tseries/index.py in _generate(cls, start, end, periods, name, offset, tz, normalize, ambiguous, closed)
    383
    384         if start is not None:
--> 385             start = Timestamp(start)
    386
    387         if end is not None:

pandas/tslib.pyx in pandas.tslib.Timestamp.__new__ (pandas/tslib.c:8967)()

pandas/tslib.pyx in pandas.tslib.convert_to_tsobject (pandas/tslib.c:22303)()

pandas/tslib.pyx in pandas.tslib.convert_str_to_tsobject (pandas/tslib.c:24364)()

pandas/tslib.pyx in pandas.tslib.convert_to_tsobject (pandas/tslib.c:23344)()

pandas/tslib.pyx in pandas.tslib._check_dts_bounds (pandas/tslib.c:26590)()

OutOfBoundsDatetime: Out of bounds nanosecond timestamp: 1-01-01 00:00:00
```
