max_rows seems to have max value of 60
Max_rows seems to have a maximum value of 60 (in 0.11 and dev, this works as expected in 0.10.1):

```
In [1]: %paste
from pandas import *
n = 100
foo = DataFrame(index=range(n))
foo['floats'] = np.random.randn(n)

set_option('display.max_rows', 101)

## -- End pasted text --

In [2]: foo.head(100)
Out[2]:
<class 'pandas.core.frame.DataFrame'>
Int64Index: 100 entries, 0 to 99
Columns: 1 entries, floats to floats
dtypes: float64(1)

In [3]: foo.head(61)
Out[3]:
<class 'pandas.core.frame.DataFrame'>
Int64Index: 61 entries, 0 to 60
Data columns (total 1 columns):
floats    61  non-null values
dtypes: float64(1)

In [4]: foo.head(60)
Out[4]:
      floats
0  -0.631717
1   0.231468
2  -0.465971
3  -1.427025
...
```

```
In [5]: %paste
set_option('display.max_rows', 10)

## -- End pasted text --

In [6]: foo.head(10)
Out[6]:
     floats
0 -0.194574
1 -0.130100
2  0.547474
3  0.669904
4  0.776946
5 -2.384084
6 -0.011147
7 -0.272660
8 -0.051326
9  1.757020

In [7]: foo.head(11)
Out[7]:
<class 'pandas.core.frame.DataFrame'>
Int64Index: 11 entries, 0 to 10
Data columns (total 1 columns):
floats    11  non-null values
dtypes: float64(1)
```

```
In [8]: version.version # same true for 0.11
Out[8]: '0.12.0.dev-d925966'
```

Essentially from http://stackoverflow.com/questions/16424493/pandas-setting-no-of-max-rows.

Related: #3395, #3426.
