bug parsing escaped quotechars inside quotechars (and possibly other escaped characters as well?)
Trouble parsing quotechars with escaped quotechars inside them

``` python
line = 'col1\n"\\"a,b,c\\""\n'

pandas.read_csv(StringIO(line))
Out[25]: 
    col1
a b  c""

pandas.read_csv(StringIO(line)).ix[0]
Out[26]: 
col1    c""
Name: (a, b)
```

i was expecting

``` python
pandas.read_csv(StringIO(line))

     col1
0  "a,b,c"
```

and

``` python
pandas.read_csv(StringIO(line)).ix[0]['col1']

'"a,b,c"'
```
