Add draft RIXS example

[zjttoefs]

According to travis the file does not pass the feature test.

[markbasham]

Just to clarify

=== examples/draft_fake_rixs.nxs ===
Entry "definition" appears to contain the following features (they validate correctly): 
    The following features failed to validate:
        NXrixs (000000005A403F80) is invalid with the following errors:
            No detectors found with any required fields
Entry "entry" appears to contain the following features (they validate correctly): 
    The following features failed to validate:
        NXrixs (000000005A403F80) is invalid with the following errors:
            No detectors found with any required fields

[PeterC-DLS]

Strange! I get:

$ python src/nxfeature.py -f 000000005A403F80 examples/draft_fake_rixs.nxs 
Entry "definition" appears to contain the following features (they validate correctly): 
    NXrixs (1514160000) {u'entry/andor': ['photoelectrons_energy', 'detector_sensitivity', 'energy_direction', 'energy_dispersion']}

Entry "entry" appears to contain the following features (they validate correctly): 
    NXrixs (1514160000) {u'entry/andor': ['photoelectrons_energy', 'detector_sensitivity', 'energy_direction', 'energy_dispersion']}

[markbasham]

Im getting a simmilar problem at the moment, so i will merge the request and try to fix both.

[matthew-d-jones]

I get the same result as Travis for this branch.

[markbasham]

Think its a Python3 issue, pete is investigating

[matthew-d-jones]

Yes, line 13 should be:

if str(obj.attrs["NX_class"], 'utf8') in nx_class:

[PeterC-DLS]

Is it better to use the six package then six.u(obj.attrs["NX_class"]) works in both python 2 and 3?

[matthew-d-jones]

At the meeting no one seemed to care too much about Python 2 anymore. There may be some incompatibility with exception handling for Python 2 now as well.

[PeterC-DLS]

Got a more neutral fix now