ImportError: No module named sparse.api
Pulled from github master and did install (removed previous version and build dir), but get ImportError.

``` python
In [1]: import pandas
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
...
----> 1 import pandas

<...>/lib/python2.7/site-packages/pandas/__init__.py in <module>()
     21
     22 from pandas.core.api import *
---> 23 from pandas.sparse.api import *
     24 from pandas.stats.api import *
     25

ImportError: No module named sparse.api

In [2]:
```

There is no sparce directory in <...>/lib/python2.7/site-packages/pandas.
If i build in place and import from the src directory there is no ImportError.

UPDATE:
Running git bisect, gives the following commits as first _bad_ commit;

```
b3c12b15e8c8a0f87c317fd1bf8e792805f1c582 is the first bad commit
commit b3c12b15e8c8a0f87c317fd1bf8e792805f1c582
Author: Wes McKinney <wesmckinn@gmail.com>
Date:   Sat Dec 10 16:10:26 2011 -0500

    REF: broke apart sparse.py, created sparse subpackage

:100644 100644 029e140cb88eed926b2eecf8151fc527ac6401f1 d8993b3d91be5a5b070f9960a0ba0c52e91c2445 M      .gitignore
:040000 040000 62a8d207935e494713c8cc1db338b3e82ffe7af9 fc94ae9d245f0e9747352379eccb36c3298156f6 M      pandas
```
