FIX: extend access to `quotechar` param in `DataFrame.to_csv`
Existing `pandas.core.format.CSVFormatter` param `quotechar` can now be
specified as keyword arg to `DataFrame.to_csv`

Do I need to worry about creating test(s) for this since it's passing through to an existing parameter of `pandas.core.format.CSVFormatter`?
 Yikes. Travis says it broke. I follow the failed test listed in the traceback (`test_get_components_dax` in `pandas.io.tests.test_data.TestYahoo`) through to the assert statement, including downloading the target file manually. If it's the same file I retrieved, the assert should succeed. I don't see `to_csv` calls anywhere so I'm at a loss so far as to what's wrong here. 
 you can force travis to rebuild that particular test (I saw that fail yesterday too...weird...but seems ok...so maybe a flaky test)

you should model some tests like other quoting type characters (prob in test_format.py or io/tests/test_parser.py).

yes write to a temp handle, then read back in and compare
 It def requires a bit of care, for some reason that part is fragile
 does this have an associated issue?
 Most probably not--I did not file one. 
 Closing, see #5414 sorry for the noise. 
