read in a csv column as object fails
I'm trying to read in a csv filed with columsn which look like integers, but I want to have that column as a string. According to http://stackoverflow.com/a/13384494/1380673 this should work:

```
authors = pandas.read_csv(csv_authors, encoding="iso-8859-15", converters={'author_id': object})
```

But it fails with this error stack:

```
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-36-dbf3918f89b6> in <module>()
      1 #%%timeit -n1 -r1
----> 2 authors = pandas.read_csv(csv_authors, encoding="iso-8859-15", converters={'author_id': object})

C:\portabel\Python27\lib\site-packages\pandas\io\parsers.pyc in parser_f(filepath_or_buffer, sep, dialect, compression, doublequote, escapechar, quotechar, quoting, skipinitialspace, header, index_col, names, skiprows, skipfooter, skip_footer, na_values, true_values, false_values, delimiter, converters, dtype, usecols, engine, delim_whitespace, as_recarray, na_filter, compact_ints, use_unsigned, low_memory, buffer_lines, warn_bad_lines, error_bad_lines, keep_default_na, thousands, comment, parse_dates, keep_date_col, dayfirst, date_parser, memory_map, nrows, iterator, chunksize, verbose, encoding, squeeze)
    365                     buffer_lines=buffer_lines)
    366 
--> 367         return _read(filepath_or_buffer, kwds)
    368 
    369     parser_f.__name__ = name

C:\portabel\Python27\lib\site-packages\pandas\io\parsers.pyc in _read(filepath_or_buffer, kwds)
    190         return parser
    191 
--> 192     return parser.read()
    193 
    194 _parser_defaults = {

C:\portabel\Python27\lib\site-packages\pandas\io\parsers.pyc in read(self, nrows)
    595             #     self._engine.set_error_bad_lines(False)
    596 
--> 597         ret = self._engine.read(nrows)
    598 
    599         if self.options.get('as_recarray'):

C:\portabel\Python27\lib\site-packages\pandas\io\parsers.pyc in read(self, nrows)
    902 
    903         try:
--> 904             data = self._reader.read(nrows)
    905         except StopIteration:
    906             if nrows is None:

C:\portabel\Python27\lib\site-packages\pandas\_parser.pyd in pandas._parser.TextReader.read (pandas\src\parser.c:5640)()

C:\portabel\Python27\lib\site-packages\pandas\_parser.pyd in pandas._parser.TextReader._read_low_memory (pandas\src\parser.c:5857)()

C:\portabel\Python27\lib\site-packages\pandas\_parser.pyd in pandas._parser.TextReader._read_rows (pandas\src\parser.c:6725)()

C:\portabel\Python27\lib\site-packages\pandas\_parser.pyd in pandas._parser.TextReader._convert_column_data (pandas\src\parser.c:7601)()

C:\portabel\Python27\lib\site-packages\pandas\_parser.pyd in pandas._parser._apply_converter (pandas\src\parser.c:18118)()

TypeError: object.__new__() takes no parameters

```
