BUG? import name collision in vb_suite/parser
This is a bit of an odd one, but when I run `python test_perf.py`, I get this traceback:

``` python
(pandas-dev) ~/E/p/l/p/s/p/vb_suite (to-frame-multi=) python test_perf.py -h
Traceback (most recent call last):
  File "test_perf.py", line 55, in <module>
    import pandas as pd
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pandas-0.13.0rc1_130_g0657e63-py2.7-macosx-10.8-x86_64.egg/pandas/__init__.py", line 37, in <module>
    import pandas.core.config_init
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pandas-0.13.0rc1_130_g0657e63-py2.7-macosx-10.8-x86_64.egg/pandas/core/config_init.py", line 17, in <module>
    from pandas.core.format import detect_console_encoding
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pandas-0.13.0rc1_130_g0657e63-py2.7-macosx-10.8-x86_64.egg/pandas/core/format.py", line 9, in <module>
    from pandas.core.index import Index, MultiIndex, _ensure_index
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pandas-0.13.0rc1_130_g0657e63-py2.7-macosx-10.8-x86_64.egg/pandas/core/index.py", line 11, in <module>
    import pandas.index as _index
  File "index.pyx", line 34, in init pandas.index (pandas/index.c:14961)
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pytz/__init__.py", line 35, in <module>
    from pkg_resources import resource_stream
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pkg_resources.py", line 74, in <module>
    import parser
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pandas/vb_suite/parser.py", line 1, in <module>
    from vbench.api import Benchmark
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/vbench/__init__.py", line 2, in <module>
    import vbench.log
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/vbench/vbench/__init__.py", line 2, in <module>
    import vbench.log
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/vbench/log.py", line 34, in <module>
    from vbench.config import is_interactive
  File "/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/vbench/vbench/config.py", line 3, in <module>
    TIME_ZONE = pytz.timezone('US/Eastern')
AttributeError: 'module' object has no attribute 'timezone'
```

I followed a lot of red herrings all over the place, but the actual problem seems to be some sort of namespace collision with the `parser` module in `/Users/tom/Envs/pandas-dev/lib/python2.7/site-packages/pkg_resources.py`, which I'm assuming is the [standard library parser](http://docs.python.org/2/library/parser.html).

My reason for suspecting that it's some kind of namespace collision is that renaming `pandas/vb_suite/parser.py` to `pandas/vb_suite/parser_.py` (and changing `parser` to `parser_` in `pandas/vb_suite/suite.py`) fixes the problem.

I'm doing some reading on python's import machinery to figure out if this is a bug here and what a better solution would be.
