IPAC benchmark failing

[astrofrog]

The following benchmarks are currently failing:

 62.50%] ··· Running io_ascii.time_ipac.IPACSuite.time_data_str_vals                                                                                                              failed
[ 62.50%] ····· Traceback (most recent call last):
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 792, in <module>
                    commands[mode](args)
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 769, in main_run
                    result = benchmark.do_run()
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 453, in do_run
                    return self.run(*self._current_params)
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 528, in run
                    timing = timer.timeit(number)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/timeit.py", line 186, in timeit
                    timing = self.inner(it, self.timer)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/timeit.py", line 87, in inner
                    _func()
                  File "/Users/tom/tmp/astropy-benchmarks/benchmarks/io_ascii/time_ipac.py", line 38, in time_data_str_vals
                    data.str_vals()
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/site-packages/astropy/io/ascii/core.py", line 801, in str_vals
                    self._set_fill_values(self.cols)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/site-packages/astropy/io/ascii/core.py", line 755, in _set_fill_values
                    colnames = set(self.header.colnames)
                AttributeError: 'IpacData' object has no attribute 'header'

[ 75.00%] ··· Running io_ascii.time_ipac.IPACSuite.time_get_cols                                                                                                                   failed
[ 75.00%] ····· Traceback (most recent call last):
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 792, in <module>
                    commands[mode](args)
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 769, in main_run
                    result = benchmark.do_run()
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 453, in do_run
                    return self.run(*self._current_params)
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 528, in run
                    timing = timer.timeit(number)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/timeit.py", line 186, in timeit
                    timing = self.inner(it, self.timer)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/timeit.py", line 87, in inner
                    _func()
                  File "/Users/tom/tmp/astropy-benchmarks/benchmarks/io_ascii/time_ipac.py", line 27, in time_get_cols
                    self.header.get_cols(self.lines)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/site-packages/astropy/io/ascii/ipac.py", line 212, in get_cols
                    if self.ipac_definition == 'right':
                AttributeError: 'IpacHeader' object has no attribute 'ipac_definition'

[ 87.50%] ··· Running io_ascii.time_ipac.IPACSuite.time_header_str_vals                                                                                                            failed
[ 87.50%] ····· Traceback (most recent call last):
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 792, in <module>
                    commands[mode](args)
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 769, in main_run
                    result = benchmark.do_run()
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 453, in do_run
                    return self.run(*self._current_params)
                  File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/asv-0.2.dev966+211cc811-py3.5.egg/asv/benchmark.py", line 528, in run
                    timing = timer.timeit(number)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/timeit.py", line 186, in timeit
                    timing = self.inner(it, self.timer)
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/timeit.py", line 87, in inner
                    _func()
                  File "/Users/tom/tmp/astropy-benchmarks/benchmarks/io_ascii/time_ipac.py", line 33, in time_header_str_vals
                    header.str_vals()
                  File "/Users/tom/tmp/astropy-benchmarks/env/705fbb2b350520526769cb8754181ec0/lib/python3.4/site-packages/astropy/io/ascii/ipac.py", line 278, in str_vals
                    null = col.fill_values[core.masked]
                AttributeError: 'Column' object has no attribute 'fill_values'

[100.00%] ··· Running io_ascii.time_ipac.IPACSuite.time_splitter   

@taldcroft @hamogu - is this a real regression, or should the benchmarks be updated? (if the latter, could you open a PR to update them?)