Update NDBC for Pandas

[dopplershift]

Apparently:

/Users/rmay/miniconda3/envs/unidata/lib/python3.7/site-packages/siphon/simplewebservice/ndbc.py:107: FutureWarning: read_table is deprecated, use read_csv instead.

Not sure how that will work, but here are the current offenders:

siphon/simplewebservice/ndbc.py
106:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
144:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
178:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
226:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
265:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
295:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
323:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
360:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
394:        df = pd.read_table(StringIO(content), comment='#', na_values='MM',
454:        df = pd.read_table(StringIO(resp.text), comment='#', na_values='MM',

[zbruick]

read_table has been changed to read_csv in #269. All tests pass without any other changes needed, so I think this can be closed once the PR is merged.

[zbruick]

Closed by #269.