Care with dtype line in Series repr
not good for long series. do we really need the dtype anyway?

```
you          12
the           8
and           8
a             7
it            7
for           6
in            6
gcc-40        5
to            5
installed     5
some          4
pip           4
if            4
have          4
is            4
Dtype: int64
...
'-arch'       1
off           1
unless        1
tools         1
know          1
well          1
general       1
another       1
fink          1
laptop        1
don't         1
/usr/bin      1
-arch         1
been          1
re-install    1
Dtype: int64
Length: 167, Dtype: int64
```
