ERR: clarify exceptions for invalid datetimelike ops
xref #9630

IIRC most of these are `TypeErrors` (see `tseries/tests_base.py`, section on addition/subtraction ops)
but I guess *some* are`NotImplementedError``

```
In [3]: pd.date_range('20130101',periods=5)+Timestamp('20140101')
NotImplementedError: 
```

```
In [4]: pd.date_range('20130101',periods=5)+Timestamp('20140101').to_datetime64()

TypeError: ufunc add cannot use operands with types dtype('<M8[ns]') and dtype('<M8[ns]')
```
