Properly handle data with line breaks

[loisaidasam]

The current implementation borks on data with line breaks, as pointed out by this SO comment:

https://stackoverflow.com/questions/12109622/how-to-know-the-byte-position-of-a-row-of-a-csv-file-in-python/51792959?noredirect=1#comment90828948_51792959

[loisaidasam]

$ python setup.py test
running test
running egg_info
writing csv_position_reader.egg-info/PKG-INFO
writing top-level names to csv_position_reader.egg-info/top_level.txt
writing dependency_links to csv_position_reader.egg-info/dependency_links.txt
reading manifest file 'csv_position_reader.egg-info/SOURCES.txt'
writing manifest file 'csv_position_reader.egg-info/SOURCES.txt'
running build_ext
test_bad_seek (tests.tests.DictReaderTests) ... ok
test_basic (tests.tests.DictReaderTests) ... ok
test_csv_with_newlines (tests.tests.DictReaderTests) ... FAIL
test_seek (tests.tests.DictReaderTests) ... ok
test_seek_without_setting_header (tests.tests.DictReaderTests) ... ok
test_bad_seek (tests.tests.ReaderTests) ... ok
test_basic (tests.tests.ReaderTests) ... ok
test_csv_with_newlines (tests.tests.ReaderTests) ... FAIL
test_seek (tests.tests.ReaderTests) ... ok

======================================================================
FAIL: test_csv_with_newlines (tests.tests.DictReaderTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "csv-position-reader/tests/tests.py", line 146, in test_csv_with_newlines
    "description": "Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n \n Wow.",
AssertionError: Tuples differ: (177, {'album': 'ANNO: Four Se... != (177, {'album': 'ANNO: Four Se...

First differing element 1:
{'album': 'ANNO: Four Seasons', 'description': 'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n', 'artist': 'Anna Meredith & Antonio Vivaldi'}
{'album': 'ANNO: Four Seasons', 'description': 'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n \n Wow.', 'artist': 'Anna Meredith & Antonio Vivaldi'}

  (177,
   {'album': 'ANNO: Four Seasons',
    'artist': 'Anna Meredith & Antonio Vivaldi',
-   'description': 'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n'})
+   'description': 'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n \n Wow.'})
?                                                                                                          ++++++++


======================================================================
FAIL: test_csv_with_newlines (tests.tests.ReaderTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "csv-position-reader/tests/tests.py", line 63, in test_csv_with_newlines
    "Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n \n Wow."
AssertionError: Tuples differ: (177, ['Anna Meredith & Antoni... != (177, ['Anna Meredith & Antoni...

First differing element 1:
['Anna Meredith & Antonio Vivaldi', 'ANNO: Four Seasons', 'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n']
['Anna Meredith & Antonio Vivaldi', 'ANNO: Four Seasons', 'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n \n Wow.']

  (177,
   ['Anna Meredith & Antonio Vivaldi',
    'ANNO: Four Seasons',
-   'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n'])
+   'Speaking of bold, who has the gumption to claim partial credit for the Four Seasons?!\n \n Wow.'])
?                                                                                           ++++++++


----------------------------------------------------------------------
Ran 9 tests in 0.012s

FAILED (failures=2)
Test failed: <unittest.runner.TextTestResult run=9 errors=0 failures=2>
error: Test failed: <unittest.runner.TextTestResult run=9 errors=0 failures=2>