ENH: Series item access via attribute #1903

[PhE]

Hack based on http://stackoverflow.com/questions/12383436/access-pandas-series-item-with-dot-notation-like-dataframe
Some tests included.

First contribution to this great project !
I hope this could help.

[wesm]

I wonder what the performance penalty of this is in attribute lookup time

[wesm]

%timeit s.index goes from ~130-150ns to ~350-400ns with this change. Tabling this until 0.10 (at least)

[ghost]

could probably add df.c.colX and df.r.rowX without performance hit and cleaner namespace
in ipython tab completion.

[ghost]

superceded by #3045, closing in 3..2..

[ghost]

[ghost]

I closed for a PR which I withdrew, let's keep this open for future discussion.

[cpcloud]

this was covered by #3482, closing.

[jreback]

this was closed by #3482 (will note it soon)

In [1]: s = Series([1,2,3],index=['a','b','c'])

In [2]: s.c
Out[2]: 3

In [3]: s.b
Out[3]: 2