Naming inconsistency in import of maybe_convert_indices in pandas.core.index.py
In lines 930-931 of pandas.core.index.py, the following code states

``` python
from pandas.core.indexing import _maybe_convert_indices
return _maybe_convert_indices(indexer, len(self))
```

In pandas.core.indexing.py, the function is called `maybe_convert_indices`. In the 3 other places where the function is called, it is called using the correct name. The leading underscore should be removed from the function name in index.py.
